LLMAPI only

GPT-5 Pro

OpenAI

Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error

Superseded by GPT-5.5

Specifications

Type: LLM
Access: API only
Released: October 6, 2025
License: Proprietary
Context window: 400,000 tokens
Knowledge cutoff: September 30, 2024
Input: Text, Image
Output: Text
API pricing: $15.00 in · $120.00 out / 1M tokens

Capabilities

Function callingStructured outputWeb search

Benchmarks

Reasoning

88.4

General

Humanity’s Last Exam

42

Our take

Extended-reasoning “Pro” tier of GPT-5 for the hardest problems; premium-priced and slower, it set the GPQA bar at launch.

Links

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