OpenAI: GPT-5.1-Codex-Mini
The OpenAI GPT-5.1-Codex-Mini is designed for handling both text and image inputs with a substantial context length of 400,000 tokens and supports reasoning and tools integration. It excels in processing complex queries and generating structured outputs where needed. While it boasts a blended benchmark score of 50.2 across one independent test, its pricing stands at $0.25 per million input tokens and $2.0 per million output tokens, making it more costly than some alternatives. However, for those requiring robust multimodal capabilities and advanced reasoning tools without the need for free or open-source models, this model remains a strong contender in the market.
Benchmark results
Independent, published benchmarks. Blended score 49.6 across 1 benchmark, last refreshed 2026-07-27. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 50.5 |
- Model ID
- openai/gpt-5.1-codex-mini
- Vendor
- openai
- Released
- November 2025
- Tokenizer
- GPT
- Input Modalities
- image, text
- Output Modalities
- text
- Max Output
- 128,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- no
What it costs in practice
Computed from the current $0.25/M input and $2.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.01 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.23 |
| A month of a busy support chatbot | 5M in / 2M out | $5.25 |
Category rankings
Where OpenAI: GPT-5.1-Codex-Mini places across the 2 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #12 | Code CompletionCode · of 25 ranked | 132 |
| #18 | Image CaptioningVision · of 25 ranked | 120 |
Similar models
OpenAI: GPT-5.6 Luna Pro
OpenAI: GPT-5.6 Luna
OpenAI: GPT-5.6 Terra Pro
OpenAI: GPT-5.6 Terra
OpenAI: GPT-5.4 Nano
OpenAI: GPT-5.4 Mini
Quick answers
- How much does OpenAI: GPT-5.1-Codex-Mini cost?
- $0.25 per million input tokens and $2.00 per million output tokens.
- What is OpenAI: GPT-5.1-Codex-Mini's context window?
- 400,000 tokens, roughly 600 pages of text in a single request.
- Does OpenAI: GPT-5.1-Codex-Mini support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: GPT-5.1-Codex-Mini process images?
- Yes, it accepts image input.