Context Window
400,000
Tokens
Model Cost Profile
OpenAI: GPT-5.1
Developer: openai
Pricing updated Mar 16, 2026
Input rank: #267Output rank: #301
OpenAI's GPT-5.1 offers a substantial context window of 400,000 tokens, making it suitable for complex applications such as long-form content generation, comprehensive document analysis, and advanced conversational agents. 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 can significantly impact budget planning based on usage patterns. This model is ideal for organizations requiring extensive context retention and nuanced understanding in their AI-driven solutions.
👁 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. 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 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 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 based on your workload.
01.0B
0500M
Estimated Monthly Cost
$151
25M input + 12M output tokens
Cheaper Alternatives to Compare
Quick links for cost-down decisions before production rollout.