OpenAI ships GPT-5.5 — first fully retrained base model since GPT-4.5
Codenamed "Spud," GPT-5.5 targets agentic coding and computer use, matches GPT-5.4 latency, and lands the same day API access opens for paying customers.
OpenAI on Thursday released GPT-5.5, its newest frontier model and the first fully retrained base model since GPT-4.5. The model — codenamed “Spud” internally — is pitched as a “new class of intelligence for real work,” with a focus on completing complex multi-step tasks with minimal human direction.
What’s new
- Agentic coding. GPT-5.5 sets new benchmarks on long-horizon software engineering tasks, including hand-offable refactors and multi-file changes.
- Computer use. Direct OS interaction has improved meaningfully — it’s the first GPT model positioned as production-ready for autonomous browser and desktop workflows.
- Latency parity with GPT-5.4 despite the architecture changes, per OpenAI’s benchmark disclosures.
- Pro tier. GPT-5.5 Pro shipped one day later (Apr 24) for the highest-stakes use cases.
Availability
- ChatGPT: rolling out to Plus, Pro, and Team users immediately.
- API: live as of Apr 24 with an updated system card describing additional safeguards.
- Enterprise: available via Azure and direct OpenAI contracts.
Why it matters
This is the first model release where OpenAI explicitly positions itself behind Anthropic on enterprise coding and acknowledges it. The TechCrunch coverage described GPT-5.5 as OpenAI’s move “one step closer to an AI super app” — a single surface that can plan, execute, and verify work end-to-end. Whether the new agentic capabilities close the gap with Claude Opus 4.7 (released Apr 16) is the open question.