GPT-5.1 Codex Mini
GPT-5.1 Codex Mini is worth evaluating for coding, rag, and agents when its provider route and context window match the workload.
Use it for
- Teams evaluating coding, rag, and agents
- Workloads that can use a 400k context window
- Buyers comparing 1 tracked provider route
Do not use it for
- Workloads where another current model has stronger sourced task evidence
- Family
- GPT-5.1
- Released
- 2025-11-13
- Context
- 400k
- Architecture
- Decoder Only
- Knowledge cutoff
- 2024-09
- Specialization
- code
- License
- Proprietary
Cheapest of 1 route · Vercel AI Gateway · cache read $0.025
About
GPT-5.1 Codex Mini is a smaller, faster, and more cost-efficient agentic coding model in the GPT-5.1 Codex lineup. Delivers approximately 4x more usage within ChatGPT subscriptions compared to GPT-5.1 Codex Max at a slight capability tradeoff. Priced at $0.25 per 1M input tokens and $2 per 1M output tokens via API. Available in the Codex CLI and IDE extension, where it is offered automatically when users approach their usage limit.
GPT-5.1 Codex Mini is a proprietary model in the GPT-5.1 family. The structured metadata tracks a 400k-token context window, multimodal input, reasoning, function calling, and tool use. This page tracks provider routes through Vercel AI Gateway, with the cheapest tracked route listed at $0.25 input and $2 output per 1M tokens. No headline benchmark score is tracked for GPT-5.1 Codex Mini yet.
Top use-case fit
Coding
Included by capability and metadata signals in the decision map.
RAG
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Provider price ladder
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| Vercel AI Gateway | $0.250 | $2.00 | read $0.025 | Serverless |
Capabilities
Benchmark peer barsfor Coding
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.