OpenAI: GPT-5.1-Codex-Mini
OpenAI
OpenAI: GPT-5.1-Codex-Mini by OpenAI costs $0.25 per 1M input tokens and $2.00 per 1M output tokens, with a 400K-token context window.
Pricing
Input (per 1M tokens)
$0.25
Output (per 1M tokens)
$2.00
Cached input (per 1M)
$0.03
| Provider | Input / 1M | Output / 1M |
|---|---|---|
| OpenAI | $0.25 | $2.00 |
| openrouter | $0.25 | $2.00 |
Specifications
- Provider
- OpenAI
- Context window
- 400K tokens
- Parameters
- —
- Released
- Nov 2025
- Open weights
- No
- Frontier model
- No
Benchmarks
- LMArena WebDev Elo
- 1243.4
Speed & latency
Time to first token
1.28s
Output speed
114 tok/s
Fastest host: azure (via vercel-ai-gateway).
Compare OpenAI: GPT-5.1-Codex-Mini with…
OpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-5.6 Sol Pro$10.00/1MOpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-6.1 Sol Pro$10.00/1MOpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-6.1 Sol Pro (batch)$5.00/1MOpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-6.1 Sol$10.00/1MOpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-6.1 Sol (batch)$5.00/1MOpenAI: GPT-5.1-Codex-Mini vs OpenAI: GPT-6 Luna Pro$0.50/1M
FAQ
How much does OpenAI: GPT-5.1-Codex-Mini cost?
OpenAI: GPT-5.1-Codex-Mini is priced at $0.25 per 1M input tokens and $2.00 per 1M output tokens. Output tokens cost more than input.
What is OpenAI: GPT-5.1-Codex-Mini's context window?
OpenAI: GPT-5.1-Codex-Mini supports a context window of 400K tokens — the maximum prompt plus response length it can handle in a single request.
Is OpenAI: GPT-5.1-Codex-Mini open weight?
No — OpenAI: GPT-5.1-Codex-Mini is a closed/proprietary model accessed via API.
Data as of 2026-10-14. Source: Pricing via OpenRouter API, openrouter.ai. Pricing is per 1M tokens (USD); confirm with the provider before production use.