GPT-5.1 Codex High: API Pricing, Context Window & Benchmarks
GPT-5.1 Codex High is a language model from OpenAI, released in November 2025, with multimodal input.
GPT-5.1 Codex High is optimized for complex coding tasks with enhanced reasoning capabilities. This variant provides deep code analysis, architectural planning, and sophisticated problem-solving for challenging programming tasks.
GPT-5.1 Codex High benchmarks
Capability tiers
Standing within each category, adjusted for leaderboard depth.
Real tasks performance
How GPT-5.1 Codex High performs across real-world prompt categories.
Performance by conversation depth
How GPT-5.1 Codex High holds up as conversations get longer.
Quality Tracker
GPT-5.1 Codex High Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Tue Aug 25 2026GPT-5.1 Codex High pricing
Providers
GPT-5.1 Codex High starts at $1.25 per million input tokens and $10.00 per million output tokens via OpenAI.
| Provider | Input $/M | Cached input $/M | Output $/M | Context in / out | TTFT p95 s | Output p5 c/s | Modalities in / out |
|---|---|---|---|---|---|---|---|
 OpenAI | $1.25 | — | $10.00 | 400.0K/128.0K | 3.50 | — | / |
Cached input is the discounted price for prompt tokens served from a provider cache. TTFT is time to first token. Output is characters per second; p5 is the sustained floor exceeded by 95% of observed requests.
GPT-5.1 Codex High context window
Input and output token limits for GPT-5.1 Codex High, plus how it ranks on long-context understanding.
GPT-5.1 Codex High API
Available from the model provider
GPT-5.1 Codex High has an official provider API. It is not currently routed through the LLM Stats gateway.
Read the official API documentationGPT-5.1 Codex High latency
GPT-5.1 Codex High time to first token, sustained output throughput, and failed-request rate from live API traffic over the trailing 7 days.
GPT-5.1 Codex High examples
Recent arena outputs from GPT-5.1 Codex High, picked from the highest-ranked matchups.
GPT-5.1 Codex High license
GPT-5.1 Codex High is a proprietary model available under its provider's product and API terms.
- License
- Proprietary
- Hosted access
Proprietary license - usage restrictions apply
GPT-5.1 Codex High resources
Official sources for GPT-5.1 Codex High: api documentation, official playground, official launch post.
GPT-5.1 Codex High vs other models
The most-compared alternatives to GPT-5.1 Codex High are Step-3.5-Flash, Sarvam-105B, MAI-Thinking-1. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like GPT-5.1 Codex High
Models ranked just above and below GPT-5.1 Codex High by LLM Stats score.
FAQ
Common questions about GPT-5.1 Codex High.