GPT-5.1 Mini Codex
GPT-5.1 Mini Codex is OpenAI's language model with a 272K context window and up to 128K output tokens, starting at $0.25 / 1M input and $2.00 / 1M output. A compact, code-focused variant of GPT-5.1 optimized for programming tasks and developer tooling via the Codex interface.
Capabilities
Input1/5
Text✓
Image·
Audio·
Video·
PDF·
Output1/5
Text✓
Image·
Audio·
Video·
Embedding·
Capabilities1/13
Reasoning·
Adaptive Reasoning·
Function Calling·
Parallel Function Calling·
Structured Outputs·
Native JSON Schema·
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching✓
Assistant Prefill·
Pricing by Provider
US Dollar ($)
Per 1M tokens
| Provider | Standard | |||
|---|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | Cache Write 5m $ / 1M | |
| $0.25 | $2.00 | $0.025 | $0.25 | |
Cost Calculator
US Dollar ($)
Preset:
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| GPT-5.4 Mini | 400K | $0.750 | $4.50 | Available | |
| GPT-5 Mini | 1.0M | $0.250 | $2.00 | Deprecating | |
| GPT-5.1 Mini Codex | — | 272K | $0.250 | $2.00 | Current |
| GPT-5 Mini Medium | — | — | — | — | Available |
| GPT-5.4 Mini Medium | — | — | — | — | Available |
| GPT-5.4 Mini Non-Reasoning | — | — | — | — | Available |
| GPT-5 Mini Minimal | — | — | — | — | Available |
| GPT-4.1 Mini | 1.0M | $0.400 | $1.60 | Available | |
| GPT-4o mini | 131K | $0.150 | $0.600 | Available | |
| GPT Realtime 2.1 Mini | — | 128K | $0.600 | $2.40 | Available |
| GPT Mini | 400K | $0.750 | $4.50 | Available |
Other Models
| Model | Tier | Released | Context | Input / 1M | Output / 1M |
|---|---|---|---|---|---|
| GPT-5.6 Sol | — | 1.1M | $2.00 | $10.00 | |
| GPT-5.6 Terra | — | 1.1M | $2.00 | $12.00 | |
| GPT-5.6 Luna | — | 1.1M | $0.200 | $1.20 | |
| GPT-5.5 | — | 1.1M | $5.00 | $30.00 | |
| GPT-5.4 Nano | Nano | 400K | $0.200 | $1.25 | |
| GPT-5.4 | — | 1.1M | $2.50 | $15.00 | |
| GPT-5.3 Codex | — | 400K | $1.75 | $14.00 | |
| GPT-5.2 Codex | — | 400K | $1.75 | $14.00 | |
| GPT-5.2 | — | 410K | $1.75 | $14.00 | |
| GPT-5.1 | — | 410K | $1.25 | $10.00 |