OpenAI released GPT-5.5 on April 23, 2026, making it the new top-line OpenAI model for complex work across ChatGPT and Codex.
What changed
OpenAI describes GPT-5.5 as a model built for real computer work: coding, research, data analysis, documents, spreadsheets, software operation, and tool use across multi-step tasks.
Key claims from the launch:
- Better agentic coding and long-horizon task completion than GPT-5.4.
- Same real-world per-token latency as GPT-5.4 despite higher capability.
- Fewer tokens used on Codex tasks, improving effective cost for long-running work.
- Stronger computer-use, knowledge-work, cyber, and early scientific-research performance.
Availability
- ChatGPT: GPT-5.5 Thinking is rolling out to Plus, Pro, Business, and Enterprise.
- ChatGPT Pro: GPT-5.5 Pro is rolling out to Pro, Business, and Enterprise.
- Codex: GPT-5.5 is available to Plus, Pro, Business, Enterprise, Edu, and Go plans with a 400K context window.
- API: available as of April 24, 2026.
API pricing
OpenAI lists API pricing at:
| Model | Input | Output | Context |
|---|---|---|---|
| gpt-5.5 | $5 / 1M tokens | $30 / 1M tokens | 1M |
| gpt-5.5-pro | $30 / 1M tokens | $180 / 1M tokens | not fully specified |
Batch and Flex are listed at half the standard API rate. Priority processing is 2.5x standard.
Why it matters for the tool wiki
This is a major scoring event for ChatGPT and Codex:
- ChatGPT gets a higher ceiling for professional research, data, and document work.
- Codex becomes more credible as a long-running engineering agent, not just a coding assistant.
- API pricing is materially higher than cheaper frontier and open models, so the value question becomes token efficiency plus task completion quality.
Related
- OpenAI publishes GPT-5.5 system card and bio bug bounty
- OpenAI ships WebSockets for Responses API agent loops
- ChatGPT Images 2.0 arrives in ChatGPT
Sources
Primary and corroborating references used for this news item.
Spotted an error or want to share your experience with OpenAI releases GPT-5.5 for ChatGPT, Codex, and the API?
Every tool page is re-verified on a recurring cycle, and corrections land faster when readers flag them directly. If you spot a stale fact, a missing capability, or have used OpenAI releases GPT-5.5 for ChatGPT, Codex, and the API and want to share what worked or didn't, the editorial desk reviews every message sent through this form.
Email editorial@aipedia.wiki