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
Sources
Primary and corroborating references used for this news item.