GPT-5.1-Codex-Mini Pricing
FastOpenAI · 400K tokens context
GPT-5.1-Codex-Mini from OpenAI costs $0.250 per 1 million input tokens and $2.00 per 1 million output tokens as of June 2026 (live OpenRouter data). The model supports a 400,000-token context window (approximately 300,000 words) with a 100K-token maximum output. A typical 1,000-token request costs $0.0003 in input charges; a 10,000-token request costs $0.0025.
| Input price | $0.250 / 1M tokens |
|---|---|
| Output price | $2.00 / 1M tokens |
| Output / input ratio | 8.0× |
| Context window | 400,000 tokens (~300,000 words) |
| Maximum output | 100,000 tokens |
| Cost per 1K tokens (input) | $0.0003 |
| Tier | Fast |
| Last verified |
GPT-5. 1-Codex-Mini is a smaller and faster version of GPT-5.
Input Price
$0.250
per 1 million tokens
Output Price
$2.00
per 1 million tokens
Context Window
400K tokens
max 100K output
Cost Examples
| Request Type | Tokens | Input Cost | Output Cost |
|---|---|---|---|
| 1,000 word article | 1,333 | $0.000333 | $0.0008 |
| 10-page document (2,500 words) | 3,333 | $0.000833 | $0.002 |
| 1,000 lines of code | 5,000 | $0.00125 | $0.003 |
| 100K token document | 100,000 | $0.025 | $0.06 |
Output cost estimated at 30% of input token count. Use the calculator for exact figures.
Strengths
- ✓Affordable at $0.25/1M input tokens
- ✓Large 400K-token context window
- ✓Low latency for high-throughput workloads
- ✓Multimodal: understands images as well as text
Limitations
- –Less capable than flagship models on complex reasoning
- –Quality and availability can vary by hosting provider
Best Use Cases
Calculate GPT-5.1-Codex-Mini Costs
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Open Calculator →GPT-5.1-Codex-Mini — FAQ
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