OpenAI: GPT-5.1-Codex
The OpenAI model supports both text and image inputs, allowing it to handle various data formats. It also features a high context length of 400,000 tokens, enabling in-depth processing of complex information. The model is equipped with tools for reasoning and supporting structured output, although the latter is not specified. Considering its pricing and performance, this model may be suitable for those who require robust image-text processing capabilities at a cost of $1.25 per million input tokens and $10.00 per million output tokens. Its blended benchmark score of 58.0 suggests it holds its own against other models in independent evaluations, making it worth shortlisting for applications where high context handling is essential.
Benchmark results
Independent, published benchmarks. Blended score 58.0 across 1 benchmark, last refreshed 2026-09-04. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 58.7 |
- Model ID
- openai/gpt-5.1-codex
- Vendor
- openai
- Released
- November 2025
- Tokenizer
- GPT
- Input Modalities
- text, image
- 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 $1.25/M input and $10.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.05 |
| Classify 1,000 customer emails | 500k in / 50k out | $1.12 |
| A month of a busy support chatbot | 5M in / 2M out | $26.25 |
Similar models
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OpenAI: GPT-5.6 Luna (batch)
OpenAI: GPT-5.6 Terra Pro
Quick answers
- How much does OpenAI: GPT-5.1-Codex cost?
- $1.25 per million input tokens and $10.00 per million output tokens.
- What is OpenAI: GPT-5.1-Codex's context window?
- 400,000 tokens, roughly 600 pages of text in a single request.
- Does OpenAI: GPT-5.1-Codex support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: GPT-5.1-Codex process images?
- Yes, it accepts image input.