OpenAI's latest fully retrained foundation model with parallel reasoning
Updated means this listing was last refreshed on May 3, 2026.
GPT-5.5 launched April 23, 2026. First fully retrained base model since GPT-4.5. Features parallel reasoning in Pro mode, 256K context window, native multimodal, and API at $5/$30 per million tokens.
87.6% SWE-bench — the strongest coding model available
The world's most popular AI assistant — now powered by GPT-5.5
Ultra-low-cost reasoning model rivaling frontier performance
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Voicenotes
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Wispr Flow
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Free
GPT-5.5 mini, limited usage
Plus
GPT-5.5, 50 messages/3hr
Pro
GPT-5.5 Pro parallel reasoning, Codex
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