OpenAI: GPT-5.1-Codex-Mini
Analysis Summary
GPT-5.1-Codex-Mini is OpenAI's smaller, cost-optimised coding variant, posting an intelligence index of 38.6 and a coding index of 36.4. Livecodebench at 0.836 and GPQA at 0.813 confirm capable performance for a mini-tier model. Vision, tool use, function calling, and a 400K context window are all present, giving it a broad capability profile relative to its price.
For businesses, this model is well-suited to coding assistance, automated code review, and structured content generation where cost efficiency matters. The agentic index of 48.1 is moderate, making it less reliable for complex multi-step autonomous tasks compared to the full GPT-5.1 or Codex variants. Instruction following (ifbench 0.679) is adequate for most business content workflows.
At $0.25 input and $2.00 output, it offers strong value for technical teams running high-volume coding or content tasks. Teams that need GPT-5.1-class reasoning at a fraction of the cost will find Codex-Mini a practical choice for non-critical or high-throughput workloads.
Assessed June 6, 2026
Editorial notes
GPT-5.1-Codex-Mini from OpenAI offers strong coding and reasoning at a significantly lower price point, with vision, tool use, and a 400K context window for cost-conscious technical teams.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How OpenAI: GPT-5.1-Codex-Mini compares
OpenAI: GPT-5.1-Codex-Mini ranks #66 of 377 AI models we track for overall intelligence, #60 of 314 for coding, #95 of 289 for agentic tasks. Its 400K-token context window is larger than 85% of the models we list. At $0.25 per million input tokens it is cheaper than 48% of comparable models.
About OpenAI: GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
Capabilities
Performance Indices
Source: Artificial Analysis
Benchmark Scores
Intelligence
Technical
Content
Benchmark data from Artificial Analysis and Hugging Face
How does OpenAI: GPT-5.1-Codex-Mini stack up?
Compare side-by-side with other professional models.
Model Information
| OpenRouter ID |
openai/gpt-5.1-codex-mini
|
| Provider | openai |
| Release Date | November 13, 2025 |
| Context Length | 400,000 tokens |
| Max Completion | 100,000 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.25 | $0.000250 |
| Output | $2.00 | $0.002000 |
Live Performance
Live endpoint metrics, refreshed every 30 minutes.
Leaderboard Categories
External Resources
Frequently asked questions about OpenAI: GPT-5.1-Codex-Mini
How much does OpenAI: GPT-5.1-Codex-Mini cost?
OpenAI: GPT-5.1-Codex-Mini costs $0.25 per million input tokens and $2.00 per million output tokens.
What is the context window of OpenAI: GPT-5.1-Codex-Mini?
OpenAI: GPT-5.1-Codex-Mini has a context window of 400,000 tokens (400K).
Is OpenAI: GPT-5.1-Codex-Mini good for coding?
On our coding benchmark index, OpenAI: GPT-5.1-Codex-Mini ranks #60 of 314 models, placing it in the top quartile of the field for code generation and debugging.
What can OpenAI: GPT-5.1-Codex-Mini do?
OpenAI: GPT-5.1-Codex-Mini supports image/vision input, tool use, and function calling.
Who created OpenAI: GPT-5.1-Codex-Mini?
OpenAI: GPT-5.1-Codex-Mini is developed by OpenAI and was released on November 13, 2025.
