OpenAI
OpenAI
AI model · United States ·Apr 2026

GPT-5.5 Pro

Proprietary
1M
Context
5
Benchmarks

About GPT-5.5 Pro

GPT-5.5 Pro is an AI model developed by OpenAI, released in 2026, made available as a proprietary (API-only) model. GPT-5.5 Pro is the higher-effort variant of GPT-5.5, available to ChatGPT Pro/Business/Enterprise users and via the API..

On this page you'll find GPT-5.5 Pro's full specifications, including a context window of 1M tokens, 5 benchmark results. Review provider pricing and benchmark scores below, or compare GPT-5.5 Pro head-to-head with other AI models.

→ More models by OpenAI → AI benchmarks leaderboard

Links

Announcement ↗ Paper ↗ API docs ↗

Community

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GPT-5.5 Pro benchmark scores▶
Compare on the benchmark table →
Benchmark Category Score Variant
SWE-bench Verified code 80.5% parallel-compute
AIME 2025 math 96.5% parallel-compute
ARC-AGI-2 reasoning 12% parallel-compute
GPQA Diamond reasoning 91.2% parallel-compute
Humanity's Last Exam reasoning 34.1% parallel-compute

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Frequently asked questions

What is GPT-5.5 Pro? ▶

GPT-5.5 Pro is the higher-effort variant of GPT-5.5, available to ChatGPT Pro/Business/Enterprise users and via the API. It is tracked on GenAIList with its specifications, benchmark scores and provider pricing.

Who created GPT-5.5 Pro? ▶

GPT-5.5 Pro was developed by OpenAI and released in 2026.

Is GPT-5.5 Pro open source or proprietary? ▶

GPT-5.5 Pro is a proprietary model. It is accessed through an API rather than by downloading the weights.

What is GPT-5.5 Pro's context window? ▶

GPT-5.5 Pro supports a context window of 1M tokens.

How much does GPT-5.5 Pro cost? ▶

Pricing for GPT-5.5 Pro depends on the provider. See the providers table on this page for the latest API rates.

How does GPT-5.5 Pro perform on benchmarks? ▶

GPT-5.5 Pro is benchmarked across 5 evaluations on GenAIList, including SWE-bench Verified (80.5%). See the full benchmark table below and compare it with other models.

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