GPT-5.1 Thinking

OpenAI

OpenAI's premier thinking model with precisely tuned adaptive reasoning. This upgraded version excels at complex analytical tasks, sophisticated coding, and multi-step problem-solving with transparent thought processes.

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Capabilities

Thinking

Tool Use

Image Input

Image Generation

PDF Input

Technical Specifications

Context Window

400,000 tokens

Max Output

128,000 tokens

Pricing

Token Costs (per 1M tokens)

Cache Miss Input

$1.25

Non-Reasoning Output

$10

Cache Read Input

$0.125

Tool Costs (per 1K calls)

Web Search

$15

Code Execution

$0.19

Retired

Made legacy on

Reason

Merged

Recommended Replacement

GPT-5.4

Retired on