GPT-5.1-Codex-Mini
OpenAIReleased Nov 13, 2025
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
- Context window
- 400K tokens
- Max output
- 100K tokens
- Input
- image, text
- Output
- text
- Tokenizer
- GPT
- Released
- Nov 13, 2025
- Reasoning
- optional
Pricing
Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.
| Per 1M tokens | Provider | + 3% fee | You pay |
|---|---|---|---|
| Input | $0.250 | $0.0075 | $0.258 |
| Output | $2.00 | $0.060 | $2.06 |
| Cache read | $0.025 | $0.0008 | $0.026 |
Benchmarks
Design Arena
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| 3Dmodels | 1066 | 32.9% | #82 |
| ASCII artmodels | 1151 | 43% | #39 |
| Codemodels | 1143 | 41.5% | #72 |
| Data vizmodels | 1141 | 40.6% | #70 |
| Game devmodels | 1158 | 43.5% | #63 |
| SVGmodels | 1035 | 35.3% | #66 |
| UI componentsmodels | 1135 | 40.8% | #65 |
| Websitesmodels | 1153 | 42.8% | #71 |
Head-to-head preference voting. How we filter and rank
Supported parameters
- include_reasoning
- max_completion_tokens
- max_tokens
- reasoning
- response_format
- seed
- structured_outputs
- tool_choice
- tools
Call it
OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model openai/gpt-5.1-codex-mini.
curl https://api.openkey.ai/v1/chat/completions \
-H "Authorization: Bearer $OPENKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-5.1-codex-mini",
"messages": [{"role": "user", "content": "Hello"}]
}'import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.openkey.ai/v1",
api_key=os.environ["OPENKEY_API_KEY"],
)
completion = client.chat.completions.create(
model="openai/gpt-5.1-codex-mini",
messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.openkey.ai/v1",
apiKey: process.env.OPENKEY_API_KEY,
});
const completion = await client.chat.completions.create({
model: "openai/gpt-5.1-codex-mini",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Questions
- How much does GPT-5.1-Codex-Mini cost via API?
- Through OpenKey, GPT-5.1-Codex-Mini costs $0.258 per 1M input tokens and $2.06 per 1M output tokens. That is the provider price ($0.250 / $2.00) plus a flat 3% fee — nothing else.
- What is GPT-5.1-Codex-Mini's context window?
- GPT-5.1-Codex-Mini accepts up to 400K tokens of context and returns up to 100K tokens per request.
- Is GPT-5.1-Codex-Mini OpenAI-compatible?
- Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "openai/gpt-5.1-codex-mini" using any OpenAI SDK — only the base URL and API key change.
- What inputs does GPT-5.1-Codex-Mini support?
- GPT-5.1-Codex-Mini accepts image, text input and produces text output.
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