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Favicon for openai

OpenAI: GPT-5.1

openai/gpt-5.1

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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 and Design Arena)
SourceBenchmarkScore
Artificial AnalysisGPT-5.1 (high) Coding Index49.4
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) GDPval-AA15.6%
Artificial AnalysisGPT-5.1 (high) CritPt4.9%
Artificial AnalysisGPT-5.1 (high) Terminal-Bench Hard45.5%
Artificial AnalysisGPT-5.1 (high) AA-Omniscience Accuracy37.7%
Artificial AnalysisGPT-5.1 (high) AA-Omniscience Non-Hallucination Rate48.1%
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) Terminal-Bench Hard22.7%
Artificial AnalysisGPT-5.1 (Non-reasoning) AA-Omniscience Accuracy29.5%
Artificial AnalysisGPT-5.1 (Non-reasoning) AA-Omniscience Non-Hallucination Rate9.4%
Design ArenaGPT-5.1 (High) Models Arena 3D Elo1079
Design ArenaGPT-5.1 (High) Models Arena Asciiart Elo1072
Design ArenaGPT-5.1 (High) Models Arena Code Categories Elo1180
Design ArenaGPT-5.1 (High) Models Arena Data Visualization Elo1204
Design ArenaGPT-5.1 (High) Models Arena Game Development Elo1192
Design ArenaGPT-5.1 (High) Models Arena SVG Elo1149
Design ArenaGPT-5.1 (High) Models Arena UI Component Elo1168
Design ArenaGPT-5.1 (High) Models Arena Website Elo1195

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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Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
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Availability over the last 3 days

Last 72 hours
Availability 99.86%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.91%
Without Routing
99.62%

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.

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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

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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

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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.

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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

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GPT-6 Luna Pro

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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

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

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