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Favicon for openai

OpenAI: GPT-5.1-Codex-Mini

openai/gpt-5.1-codex-mini

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GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

Modalities
In / Out Price
$0.25 / $2per 1M
Context
400K
Released
Nov 13, 2025
Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

Providers

This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make.

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-Codex-Mini (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial AnalysisGPT-5.1 Codex mini (High) Math Index91.7
Artificial AnalysisGPT-5.1 Codex mini (High) GPQA Diamond81.3%
Artificial AnalysisGPT-5.1 Codex mini (High) HLE18.5%
Artificial AnalysisGPT-5.1 Codex mini (High) IFBench67.9%
Artificial AnalysisGPT-5.1 Codex mini (High) τ²-Bench Telecom62.9%
Artificial AnalysisGPT-5.1 Codex mini (High) AA-LCR66.7%
Artificial AnalysisGPT-5.1 Codex mini (High) CritPt0.0%
Artificial AnalysisGPT-5.1 Codex mini (High) LiveCodeBench83.6%
Artificial AnalysisGPT-5.1 Codex mini (High) Terminal-Bench Hard33.3%
Artificial AnalysisGPT-5.1 Codex mini (High) MMLU-Pro82.0%
Artificial AnalysisGPT-5.1 Codex mini (High) AIME 202591.7%
Design ArenaGPT-5.1 Codex Mini Models Arena 3D Elo984
Design ArenaGPT-5.1 Codex Mini Models Arena Asciiart Elo1102
Design ArenaGPT-5.1 Codex Mini Models Arena Code Categories Elo1092
Design ArenaGPT-5.1 Codex Mini Models Arena Data Visualization Elo1097
Design ArenaGPT-5.1 Codex Mini Models Arena Game Development Elo1092
Design ArenaGPT-5.1 Codex Mini Models Arena SVG Elo976
Design ArenaGPT-5.1 Codex Mini Models Arena UI Component Elo1076
Design ArenaGPT-5.1 Codex Mini Models Arena Website Elo1109

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.

Not currently available through EU in-region routing. In-region routing docs

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Latency / throughput
$0.25$2.00$0.035.47s52 tps
99.46%
Throughput
52tok/s

P50, best across providers

Latency
5.47s

P50, best provider

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.
99.84%

Availability over the last 3 days

Last 72 hours
Availability 99.84%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.78%

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 provider routing options.

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Frequently asked questions

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

GPT-5.1-Codex-Mini costs $0.25/M input tokens and $2.00/M output tokens, with separate rates for Cache Read at $0.03/M tokens.

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

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

GPT-5.1-Codex-Mini accepts images and text as input and returns text.

GPT-6.1 Terra Pro, GPT-6.1 Terra, GPT-6 Luna Decisions and 62 more are other text models from OpenAI.

GPT-5.1-Codex-Mini was released on November 13, 2025.