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Favicon for anthropic

Anthropic: Claude Opus 4.8

anthropic/claude-opus-4.8

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Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for highly autonomous agents, long-horizon agentic work, knowledge work, and memory-driven tasks where coherence over extended sessions matters.

It is particularly strong on multi-step reasoning, complex coding, and end-to-end project orchestration - large codebases, multi-stage debugging, and long-running asynchronous agent pipelines. Beyond coding, it handles knowledge work such as drafting documents, building presentations, and analyzing data, maintaining quality across very long outputs.

Modalities
In / Out Price
$5 / $25per 1M
Context
1.0M
Released
May 27, 2026
Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), Floor (cheapest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for Anthropic: Claude Opus 4.8 (Artificial Analysis, Design Arena and Vals AI)
SourceBenchmarkScore
Artificial AnalysisClaude Opus 4.8 (Max) Intelligence Index41.8
Artificial AnalysisClaude Opus 4.8 (Max) Coding Index74.3
Artificial AnalysisClaude Opus 4.8 (Max) Agentic Index41.9
Artificial AnalysisClaude Opus 4.8 (Max) GPQA Diamond92.0%
Artificial AnalysisClaude Opus 4.8 (Max) HLE48.7%
Artificial AnalysisClaude Opus 4.8 (Max) IFBench62.2%
Artificial AnalysisClaude Opus 4.8 (Max) τ²-Bench Telecom94.4%
Artificial AnalysisClaude Opus 4.8 (Max) AA-LCR77.7%
Artificial AnalysisClaude Opus 4.8 (Max) τ-Bench Banking34.2%
Artificial AnalysisClaude Opus 4.8 (Max) GDPval-AA47.8%
Artificial AnalysisClaude Opus 4.8 (Max) CritPt20.9%
Artificial AnalysisClaude Opus 4.8 (Max) SciCode54.4%
Artificial AnalysisClaude Opus 4.8 (Max) Terminal-Bench Hard58.3%
Artificial AnalysisClaude Opus 4.8 (Max) Terminal-Bench 4.021.7%
Artificial AnalysisClaude Opus 4.8 (Max) Terminal-Bench 2.184.6%
Artificial AnalysisClaude Opus 4.8 (Max) AA-Omniscience Accuracy48.8%
Artificial AnalysisClaude Opus 4.8 (Max) AA-Omniscience Non-Hallucination Rate60.7%
Design ArenaClaude Opus 4.8 Agents Arena Agenticgamedev Elo1238
Design ArenaClaude Opus 4.8 Agents Arena Agentichtmlslides Elo1227
Design ArenaClaude Opus 4.8 Agents Arena Agenticslides Elo1294
Design ArenaClaude Opus 4.8 Agents Arena Agenticslides(Html) Elo1230
Design ArenaClaude Opus 4.8 Agents Arena Agenticslides(Python-Pptx) Elo1310
Design ArenaClaude Opus 4.8 Agents Arena Androidnative Elo1247
Design ArenaClaude Opus 4.8 Agents Arena Full Stack Elo1248
Design ArenaClaude Opus 4.8 Agents Arena Godotgamedev Elo1231
Design ArenaClaude Opus 4.8 Agents Arena Htmlslides Elo1220
Design ArenaClaude Opus 4.8 Agents Arena Mobile Apps Elo1223
Design ArenaClaude Opus 4.8 Agents Arena Pptxslides Elo1306
Design ArenaClaude Opus 4.8 Agents Arena Python-Pptxslides Elo1298
Design ArenaClaude Opus 4.8 Agents Arena Python-Pptxslides Elo1227
Design ArenaClaude Opus 4.8 Agents Arena Webapps Elo1224
Design ArenaClaude Opus 4.8 Models Arena 3D Elo1238
Design ArenaClaude Opus 4.8 Models Arena Asciiart Elo1289
Design ArenaClaude Opus 4.8 Models Arena Code Categories Elo1259
Design ArenaClaude Opus 4.8 Models Arena Data Visualization Elo1247
Design ArenaClaude Opus 4.8 Models Arena Game Development Elo1276
Design ArenaClaude Opus 4.8 Models Arena SVG Elo1195
Design ArenaClaude Opus 4.8 Models Arena UI Component Elo1265
Design ArenaClaude Opus 4.8 Models Arena Website Elo1263
Vals AIClaude Opus 4.8 Code Migration47.3%
Vals AIClaude Opus 4.8 CorpFin v266.7%
Vals AIClaude Opus 4.8 EMB69.4%
Vals AIClaude Opus 4.8 Finance Agent (v2)53.9%
Vals AIClaude Opus 4.8 GPQA Diamond92.4%
Vals AIClaude Opus 4.8 Harvey's Legal Agent Benchmark9.6%
Vals AIClaude Opus 4.8 LiveCodeBench87.8%
Vals AIClaude Opus 4.8 LegalBench83.6%
Vals AIClaude Opus 4.8 Legal Research Bench43.8%
Vals AIClaude Opus 4.8 MedCode53.2%
Vals AIClaude Opus 4.8 MedScribe85.8%
Vals AIClaude Opus 4.8 MMLU Pro89.6%
Vals AIClaude Opus 4.8 MMMU Pro86.6%
Vals AIClaude Opus 4.8 MortgageTax69.9%
Vals AIClaude Opus 4.8 ProgramBench1.0%
Vals AIClaude Opus 4.8 ProofBench v169.0%
Vals AIClaude Opus 4.8 Vals RSI Index24.0%
Vals AIClaude Opus 4.8 SAGE54.8%
Vals AIClaude Opus 4.8 SkillsBench59.2%
Vals AIClaude Opus 4.8 SWE-bench88.6%
Vals AIClaude Opus 4.8 Tax Agent Bench64.9%
Vals AIClaude Opus 4.8 TaxEval v275.6%
Vals AIClaude Opus 4.8 Terminal-Bench 4.023.2%
Vals AIClaude Opus 4.8 Vals Index55.1%
Vals AIClaude Opus 4.8 Vals Multimodal Index70.9%
Vals AIClaude Opus 4.8 Vibe Code Bench v1.182.7%

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

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Throughput
150tok/s

P50, best across providers

Latency
0.71s

P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchClaude Platform on AWS90.2%77.5%Azure (US)89.8%77.9%Google Vertex (EU)90.2%76.6%Anthropic89.6%77.1%auto-routing90.1%76.4%Google Vertex90.2%75.3%Google Vertex (US)90.4%75.1%Azure90.2%75.0%
+1 more providers
Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.96%

Availability over the last 3 days

Last 72 hours
Availability 99.96%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.93%
Without Routing
88.15%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

1.
Favicon for https://claude.ai/apple-touch-icon.png
Claude Code
Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.
238Btokens
2.
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Hermes Agent
Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.
101Btokens
3.
Favicon for https://openclaw.ai/
OpenClaw
OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.
29.7Btokens
4.
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Nous Research API
Nous Research is an AI research team focused on advancing open-source AI.
23.9Btokens
5.
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pi
There are many coding agents, but this one is yours.
19.4Btokens

Frequently asked questions

Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for highly autonomous agents, long-horizon agentic work, knowledge work, and memory-driven tasks where coherence over extended sessions matters.

Claude Opus 4.8 costs $5.00/M input tokens and $25.00/M output tokens, with separate rates for Cache Read at $0.50/M tokens, Cache Write at $6.25/M tokens, Cache Write (1h) at $10.00/M tokens, and Web Search at $10.00/1K calls.

Claude Opus 4.8 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.

Yes. Claude Opus 4.8 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Claude Opus 4.8 accepts text, images, and files such as PDFs as input and returns text.

Claude Opus 4.8 is served by 5 providers on OpenRouter: Claude Platform on AWS, Azure, Amazon Bedrock, Google Vertex, and Anthropic. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

Claude Opus 4.8 was released on May 27, 2026.

More models from Anthropic

Claude Sonnet 5.5

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing polished documents, slides, and spreadsheets, and it writes and communicates more clearly than its predecessor.

Thinking is always on, so effort is the main lever for trading off depth, latency, and cost, and lower effort settings keep it responsive for everyday agentic loops.

Text1M context$2 / $10
Claude Sonnet 5.5

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing polished documents, slides, and spreadsheets, and it writes and communicates more clearly than its predecessor.

Thinking is always on, so effort is the main lever for trading off depth, latency, and cost, and lower effort settings keep it responsive for everyday agentic loops.

Text1M context$1 / $5
Claude Opus 5.5

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code review and bug finding, financial and scientific analysis, and reading dense charts, diagrams, and screenshots, and it is more careful than its predecessor about only stating figures and citing sources it can back up.

The model completes comparable tasks in fewer steps and with fewer tokens than Opus 5, and reports on its work in plainer language, with clear updates on what it did, what it found, and what it needs from the user. Thinking is always adaptive, so effort is the main lever for trading off depth, latency, and cost, and lower effort settings remain effective for latency-sensitive workloads.

Text1M context$4 / $20
Claude Opus 5.5

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code review and bug finding, financial and scientific analysis, and reading dense charts, diagrams, and screenshots, and it is more careful than its predecessor about only stating figures and citing sources it can back up.

The model completes comparable tasks in fewer steps and with fewer tokens than Opus 5, and reports on its work in plainer language, with clear updates on what it did, what it found, and what it needs from the user. Thinking is always adaptive, so effort is the main lever for trading off depth, latency, and cost, and lower effort settings remain effective for latency-sensitive workloads.

Text1M context$2 / $10
Claude Fable 5.1

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries. We recommend testing it as a direct upgrade wherever you use Fable 5 today, and alongside Opus 5 on reasoning-heavy tasks.

Text1M context$10 / $50
Claude Fable 5.1

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries. We recommend testing it as a direct upgrade wherever you use Fable 5 today, and alongside Opus 5 on reasoning-heavy tasks.

Text1M context$5 / $25
Claude Opus 5

Fast-mode variant of Opus 5 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5.

Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

Note: As of September 1, 2026, this dedicated fast model is deprecated. Fast mode is now served by the fast service tier endpoint on Claude Opus 5 — request it with service_tier: "fast" or speed: "fast". Requests to this model keep working and are served by the same fast tier capacity, so no action is required, but new integrations should target the regular model. Learn more in our service tier docs: https://openrouter.ai/docs/guides/features/service-tiers

Text1M context
Claude Opus 5

Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis of charts and documents, complex office deliverables, and coordinating parallel subagents.

The model maintains strong instruction following and tool use across extended tasks, while remaining effective at lower effort settings for workloads that prioritize latency and token efficiency.

Text1M context$5 / $25
Claude Opus 5

Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis of charts and documents, complex office deliverables, and coordinating parallel subagents.

The model maintains strong instruction following and tool use across extended tasks, while remaining effective at lower effort settings for workloads that prioritize latency and token efficiency.

Text1M context$2.50 / $12.50
Claude Sonnet 5

Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max, and x-high), a 1M-token context window, and text, image, and file inputs. Sonnet 5 uses an updated tokenizer and includes real-time cyber safeguards that block certain high-risk dual-use activities.

Text1M context$2 / $10
Claude Sonnet 5

Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max, and x-high), a 1M-token context window, and text, image, and file inputs. Sonnet 5 uses an updated tokenizer and includes real-time cyber safeguards that block certain high-risk dual-use activities.

Text1M context$1 / $5
Claude Fable Latest

This model always redirects to the latest model in the Claude Fable family.

Text1M context
Claude Fable 5

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for long-running, complex, and asynchronous tasks that previously required frequent human check-ins.

It is particularly strong at end-to-end work that would otherwise take a person hours, days, or weeks - taking on problems that are long-running, ambiguous, or highly multi-step. It executes well-scoped tasks with few mistakes, automatically self-correcting through verification loops, and ships with robust safeguards.

Text1M context$10 / $50
Claude Fable 5

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for long-running, complex, and asynchronous tasks that previously required frequent human check-ins.

It is particularly strong at end-to-end work that would otherwise take a person hours, days, or weeks - taking on problems that are long-running, ambiguous, or highly multi-step. It executes well-scoped tasks with few mistakes, automatically self-correcting through verification loops, and ships with robust safeguards.

Text1M context$5 / $25
Claude Opus 4.8

Fast-mode variant of Opus 4.8 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8.

Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

Note: As of September 1, 2026, this dedicated fast model is deprecated. Fast mode is now served by the fast service tier endpoint on Claude Opus 4.8 — request it with service_tier: "fast" or speed: "fast". Requests to this model keep working and are served by the same fast tier capacity, so no action is required, but new integrations should target the regular model. Learn more in our service tier docs: https://openrouter.ai/docs/guides/features/service-tiers

Text1M context
Claude Opus 4.8

Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for highly autonomous agents, long-horizon agentic work, knowledge work, and memory-driven tasks where coherence over extended sessions matters.

It is particularly strong on multi-step reasoning, complex coding, and end-to-end project orchestration - large codebases, multi-stage debugging, and long-running asynchronous agent pipelines. Beyond coding, it handles knowledge work such as drafting documents, building presentations, and analyzing data, maintaining quality across very long outputs.

Text1M context$2.50 / $12.50
Claude Opus 4.7

Fast-mode variant of Opus 4.7 - identical capabilities with higher output speed at premium 6x pricing.

Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

Text1M context
Claude Haiku Latest

This model always redirects to the latest model in the Claude Haiku family.

Text200K context
Claude Sonnet Latest

This model always redirects to the latest model in the Claude Sonnet family.

Text1M context
Claude Opus Latest

This model always redirects to the latest model in the Claude Opus family.

Text1M context