GPT-5.1-Codex API pricing
As of October 22, 2026, OpenAI GPT-5.1-Codex costs $1.25 per million input tokens and $10.00 per million output tokens, the median of 1 providers on OpenRouter, with cached input at $0.13 per million.
GPT-5.1-Codex benchmarks and specs · Every OpenAI model's price
- Input, per million tokens$1.25
- Output, per million tokens$10.00
- Cached input, per million$0.13
- Context window400K tokens
- Max output128K tokens
- Output speedNot measured
What a request costs
Three fixed token mixes at the list price, without cache or batch discounts. For a whole month, use the calculator.
| Workload | Tokens | One request | 1,000 requests | Fits the context window |
|---|---|---|---|---|
| Chat turn | 1K input + 500 output tokens | $0.0063 | $6.25 | Yes |
| Repository review | 50K input + 3K output tokens | $0.092 | $92.50 | Yes |
| Agent loop | 200K input + 10K output tokens | $0.350 | $350.00 | Yes |
| Solved coding task | One SWE-bench Verified attempt, divided by the share that succeed | $0.892 | $892.25 |
Price history
The price of GPT-5.1-Codex here is the median across 1 providers on OpenRouter, so we do not track price changes for it.
Cheaper models as good as GPT-5.1-Codex
Models within two points of GPT-5.1-Codex or above it on the Vibe Coding Index, with a lower output price. Cheapest first.
- Ling 3.0 Flash$0.1215 Coding 29.6 against 15.3 · 99% cheaper output
- Nemotron 3.5 Lightning$0.147 Coding 22.6 against 15.3 · 99% cheaper output
- Qwen3.5-Flash$0.26 Coding 41.1 against 15.3 · 97% cheaper output
- MiMo-V2.6-Flash$0.28 Coding 54.7 against 15.3 · 97% cheaper output
- MiMo-V2.5$0.336 Coding 50.0 against 15.3 · 97% cheaper output
GPT-5.1-Codex pricing questions
- How much does GPT-5.1-Codex cost per million tokens?
- $1.25 per million input tokens and $10.00 per million output tokens, as listed on OpenRouter on October 22, 2026.
- Does GPT-5.1-Codex support prompt caching?
- Yes. OpenRouter lists cached input at $0.13 per million tokens, against $1.25 for uncached input.
- Is there a cheaper model as good as GPT-5.1-Codex?
- Ling 3.0 Flash scores 29.6 on the Vibe Coding Index, within two points of GPT-5.1-Codex or above it, and costs $0.1215 per million output tokens.
- Has the price of GPT-5.1-Codex changed?
- The price of GPT-5.1-Codex here is the median across 1 providers on OpenRouter, so we do not track price changes for it.