Skip to content
  • Models
  • Rankings
  • Ori
OpenRouterOpenRouter
© 2026 OpenRouter, Inc

Product

  • Chat
  • Rankings
  • Benchmarks
  • Apps
  • Discover
  • Models
  • Collections
  • Providers
  • Tools
  • Pricing
  • Business
  • Enterprise
  • Labs

Company

  • About
  • Blog
  • Careers
    Hiring
  • Privacy
  • Terms of Service
  • Trust Center
  • Support
  • Works With OR
  • Data
  • Brand

Developer

  • Documentation
  • API Reference
  • Developer Platform
  • Status
  • AI Site Map

Connect

  • Discord
  • GitHub
  • LinkedIn
  • X
  • YouTube
Favicon for openai

OpenAI: GPT-5.1

openai/gpt-5.1

Compare

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning to allocate computation dynamically, responding quickly to simple queries while spending more depth on complex tasks. The model produces clearer, more grounded explanations with reduced jargon, making it easier to follow even on technical or multi-step problems.

Built for broad task coverage, GPT-5.1 delivers consistent gains across math, coding, and structured analysis workloads, with more coherent long-form answers and improved tool-use reliability. It also features refined conversational alignment, enabling warmer, more intuitive responses without compromising precision. GPT-5.1 serves as the primary full-capability successor to GPT-5

Modalities
In / Out Price
$1.25 / $10per 1M
Context
400K
Released
Nov 13, 2025
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 OpenAI: GPT-5.1 (Artificial Analysis, Design Arena and Vals AI)
SourceBenchmarkScore
Artificial AnalysisGPT-5.1 (High) Intelligence Index24.7
Artificial AnalysisGPT-5.1 (High) Coding Index49.4
Artificial AnalysisGPT-5.1 (High) Math Index94.0
Artificial AnalysisGPT-5.1 (High) GPQA Diamond87.3%
Artificial AnalysisGPT-5.1 (High) HLE28.5%
Artificial AnalysisGPT-5.1 (High) IFBench72.9%
Artificial AnalysisGPT-5.1 (High) τ²-Bench Telecom81.9%
Artificial AnalysisGPT-5.1 (High) AA-LCR80.0%
Artificial AnalysisGPT-5.1 (High) τ-Bench Banking15.9%
Artificial AnalysisGPT-5.1 (High) GDPval-AA16.5%
Artificial AnalysisGPT-5.1 (High) CritPt4.9%
Artificial AnalysisGPT-5.1 (High) LiveCodeBench86.8%
Artificial AnalysisGPT-5.1 (High) Terminal-Bench Hard45.5%
Artificial AnalysisGPT-5.1 (High) Terminal-Bench 2.152.4%
Artificial AnalysisGPT-5.1 (High) MMLU-Pro87.0%
Artificial AnalysisGPT-5.1 (High) AA-Omniscience Accuracy37.7%
Artificial AnalysisGPT-5.1 (High) AA-Omniscience Non-Hallucination Rate48.1%
Artificial AnalysisGPT-5.1 (High) AIME 202594.0%
Artificial AnalysisGPT-5.1 (Non-reasoning) Intelligence Index13.3
Artificial AnalysisGPT-5.1 (Non-reasoning) Math Index38.0
Artificial AnalysisGPT-5.1 (Non-reasoning) GPQA Diamond64.3%
Artificial AnalysisGPT-5.1 (Non-reasoning) HLE5.3%
Artificial AnalysisGPT-5.1 (Non-reasoning) IFBench43.2%
Artificial AnalysisGPT-5.1 (Non-reasoning) τ²-Bench Telecom46.5%
Artificial AnalysisGPT-5.1 (Non-reasoning) AA-LCR45.0%
Artificial AnalysisGPT-5.1 (Non-reasoning) CritPt0.0%
Artificial AnalysisGPT-5.1 (Non-reasoning) LiveCodeBench49.4%
Artificial AnalysisGPT-5.1 (Non-reasoning) Terminal-Bench Hard22.7%
Artificial AnalysisGPT-5.1 (Non-reasoning) MMLU-Pro80.1%
Artificial AnalysisGPT-5.1 (Non-reasoning) AA-Omniscience Accuracy29.5%
Artificial AnalysisGPT-5.1 (Non-reasoning) AA-Omniscience Non-Hallucination Rate9.4%
Artificial AnalysisGPT-5.1 (Non-reasoning) AIME 202538.0%
Design ArenaGPT-5.1 (High) Models Arena 3D Elo1076
Design ArenaGPT-5.1 (High) Models Arena Asciiart Elo1072
Design ArenaGPT-5.1 (High) Models Arena Code Categories Elo1177
Design ArenaGPT-5.1 (High) Models Arena Data Visualization Elo1203
Design ArenaGPT-5.1 (High) Models Arena Game Development Elo1191
Design ArenaGPT-5.1 (High) Models Arena SVG Elo1148
Design ArenaGPT-5.1 (High) Models Arena UI Component Elo1164
Design ArenaGPT-5.1 (High) Models Arena Website Elo1193
Vals AIGPT 5.1 AIME93.3%
Vals AIGPT 5.1 CaseLaw v273.4%
Vals AIGPT 5.1 CorpFin v263.8%
Vals AIGPT 5.1 Finance Agent v1.155.3%
Vals AIGPT 5.1 GPQA Diamond86.6%
Vals AIGPT 5.1 IOI v121.5%
Vals AIGPT 5.1 LiveCodeBench86.5%
Vals AIGPT 5.1 LegalBench85.7%
Vals AIGPT 5.1 MedCode52.7%
Vals AIGPT 5.1 MedQA96.4%
Vals AIGPT 5.1 MedScribe88.1%
Vals AIGPT 5.1 MGSM93.0%
Vals AIGPT 5.1 MMLU Pro86.4%
Vals AIGPT 5.1 MMMU Pro83.2%
Vals AIGPT 5.1 MortgageTax61.4%
Vals AIGPT 5.1 SAGE43.2%
Vals AIGPT 5.1 SWE-bench69.8%
Vals AIGPT 5.1 TaxEval v274.9%
Vals AIGPT 5.1 Terminal-Bench 2.044.9%
Vals AIGPT 5.1 Vals Index53.6%
Vals AIGPT 5.1 Vals Multimodal Index52.7%
Vals AIGPT 5.1 Vibe Code Bench v1.124.6%

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.

Explore more models

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionAI Model RankingsRanking
$1.250$10.00$0.13000.94s59 tps
99.89%
$1.250$10.00$0.12501.49s47 tps
100.00%
Not used in Standard routing:Why these endpoints are not used
Flex
$0.625$5.00$0.06250.85s100 tps
99.83%
$1.375$11.00$0.1430----
100.00%
Fast
$2.500$20.00$0.25000.78s--
--
Throughput
100tok/s

P50, best across providers

Latency
0.78s

P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-Benchauto-routing86.7%80.0%Azure (EU)87.2%78.0%OpenAI86.4%76.3%Azure86.0%75.3%
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.
99.94%

Availability over the last 3 days

Last 72 hours
Availability 99.94%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.92%
Without Routing
99.67%

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://dify.ai/
Dify.AI
Effortlessly manage autonomous agents and workflows.
1.33Btokens
2.
Favicon for https://spicywriter.com/
Spicy Writer
new
1.23Btokens
3.
Favicon for https://chatboxai.app/
Chatbox AI
On-device AI copilot
753Mtokens
4.
Favicon for https://app.achieveapex.com/
AchieveApex
new
648Mtokens
5.
Favicon for https://dogalicious.com/
Dr. Dogalicious AI Vet Nutritionist
new
559Mtokens

Frequently asked questions

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning to allocate computation dynamically, responding quickly to simple queries while spending more depth on complex tasks.

GPT-5.1 costs $1.25/M input tokens and $10.00/M output tokens, with separate rates for Cache Read at $0.13/M tokens.

GPT-5.1 has a 400,000 token context window. It supports up to 128,000 completion tokens.

Yes. GPT-5.1 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

GPT-5.1 accepts images, text, and files such as PDFs as input and returns text.

GPT-5.1 is served by 2 providers on OpenRouter: OpenAI and Azure. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

GPT-5.1 was released on November 13, 2025.

More models from OpenAI

GPT-6.1 Sol Pro

GPT-6.1 Sol Pro is the same underlying model as GPT-6.1 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6.1 Sol and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6.1 Sol instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$2 / $10
GPT-6.1 Sol

GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series. It is suited for agentic coding, computer use, document-heavy professional work, and multi-step business workflow automation, and approaches Astra-level results on these tasks at a much lower cost. Compared with GPT-6 Sol, it makes fewer factual errors and is more reliable at respecting explicit restrictions and user intent during agentic tasks.

Text1.1M context$2 / $10
GPT-6 Luna Pro

GPT-6 Luna Pro is the same underlying model as GPT-6 Luna, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Luna and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Luna instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$0.10 / $0.50
GPT-6 Luna Pro

GPT-6 Luna Pro is the same underlying model as GPT-6 Luna, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Luna and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Luna instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$0.05 / $0.25
GPT-6 Luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks, and at higher reasoning effort it can take on complex software engineering and computer-use tasks that previously called for a Sol-tier model. It shares the GPT-6 family's gains in factual reliability and its clearer, more concise communication style.

Text1.1M context$0.10 / $0.50
GPT-6 Luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks, and at higher reasoning effort it can take on complex software engineering and computer-use tasks that previously called for a Sol-tier model. It shares the GPT-6 family's gains in factual reliability and its clearer, more concise communication style.

Text1.1M context$0.05 / $0.25
GPT-6 Sol Pro

GPT-6 Sol Pro is the same underlying model as GPT-6 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Sol and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Sol instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$2 / $10
GPT-6 Sol Pro

GPT-6 Sol Pro is the same underlying model as GPT-6 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Sol and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Sol instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$1 / $5
GPT-6 Sol

GPT-6 Sol is the cost-efficient high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra and above the fast GPT-6 Luna tier. It is suited for demanding professional work, agentic coding, business workflow automation, and computer use, and is particularly strong at long-horizon software engineering tasks in real codebases. It approaches Astra-level factual reliability at a much lower cost and shares Astra's clearer, more concise communication style in technical and coding conversations.

Text1.1M context$2 / $10
GPT-6 Sol

GPT-6 Sol is the cost-efficient high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra and above the fast GPT-6 Luna tier. It is suited for demanding professional work, agentic coding, business workflow automation, and computer use, and is particularly strong at long-horizon software engineering tasks in real codebases. It approaches Astra-level factual reliability at a much lower cost and shares Astra's clearer, more concise communication style in technical and coding conversations.

Text1.1M context$1 / $5
GPT Astra Latest

This model always redirects to the latest model in the GPT Astra family.

Text1.1M context
GPT Sol Latest

This model always redirects to the latest model in the GPT Sol family.

Text1.1M context
GPT Terra Latest

This model always redirects to the latest model in the GPT Terra family.

Text1.1M context
GPT Luna Latest

This model always redirects to the latest model in the GPT Luna family.

Text1.1M context
GPT Image 2.5 Sunburst

GPT Image 2.5 Sunburst is an image generation and editing model from OpenAI, positioned as the precision-oriented tier of the GPT Image 2.5 series. It is suited to detailed creative work where editing accuracy matters more than generation speed, via the dedicated Images API.

Image$8 / $30
GPT Image 2.5 Flare

GPT Image 2.5 Flare is an image generation and editing model from OpenAI, positioned as the speed-oriented tier of the GPT Image 2.5 series. It is suited to high-volume everyday generation, creator content, and rapid prototyping via the dedicated Images API.

Image$8 / $30
GPT-6 Astra

GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work, and document creation, with particular strengths in long-horizon agentic tasks that involve computer and browser use.

Text1.1M context$10 / $50
GPT-6 Astra

GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work, and document creation, with particular strengths in long-horizon agentic tasks that involve computer and browser use.

Text1.1M context$5 / $25
GPT-6 Astra Pro

GPT-6 Astra Pro is the same underlying model as GPT-6 Astra, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Astra and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Astra instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$10 / $50
GPT-6 Astra Pro

GPT-6 Astra Pro is the same underlying model as GPT-6 Astra, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Astra and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 Astra instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Text1.1M context$5 / $25