Context Window
400,000
Tokens
Model Cost Profile
OpenAI: GPT-5.1-Codex-Max
Developer: openai
Pricing updated Mar 16, 2026
Input rank: #270Output rank: #304
OpenAI's GPT-5.1-Codex-Max offers a substantial context window of 400,000 tokens, making it ideal for complex applications such as code generation, natural language processing, and large-scale data analysis. Teams utilizing this API model can expect an input cost of $1.25 per million tokens and an output cost of $10.00 per million tokens, which may influence budget considerations for extensive projects. This pricing structure allows organizations to scale their usage based on specific needs, ensuring flexibility for varying workloads and applications.
👁 Vision🔧 Tool Calling🔌 MCP Compatible📋 Structured Output🧠 Reasoning
Input Price / 1M
$1.25
Prompt tokens
Output Price / 1M
$10.00
Completion tokens
Top Benchmark
Pending
No benchmark data yet
Quality & Benchmarks
Evaluation scores for OpenAI: GPT-5.1-Codex-Max. The “Top Benchmark” shown above is the highest-priority score available (MMLU > GPQA > MATH > HumanEval).
🔧
Tool Calling Supported🔌 MCP Compatible
Price History
OpenAI: GPT-5.1-Codex-Max Pricing Trend
Input / 1M tokens0.0%Output / 1M tokens0.0%
Mar 7 — Mar 16
Current Input / 1M
$1.25
Current Output / 1M
$10.00
Performance History
OpenAI: GPT-5.1-Codex-Max Speed Trend
Not enough data yet. Performance tracking started recently — check back in a few days.
Side-by-Side Pricing Table
| Usage Type | Price / 1M Tokens |
|---|---|
| Input (Prompt) | $1.25 |
| Output (Completion) | $10.00 |
| Cache Read | $0.1250 |
Cost Calculator
Estimate monthly spend for OpenAI: GPT-5.1-Codex-Max based on your workload.
01.0B
0500M
Estimated Monthly Cost
$151
25M input + 12M output tokens
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