GPT-5.4 Thinking
GPT-5.4 Thinking trades raw latency for deep, explicit reasoning steps, making it ideal for legal, financial, scientific and engineering work.
OpenAI · ChatGPT
GPT-5.4 Thinking
Extended-reasoning ChatGPT for professional workflows
GPT-5.4 Thinking trades raw latency for deep, explicit reasoning steps, making it ideal for legal, financial, scientific and engineering work.
Key features
GPT-5.4 Thinking · AI Models
Context window
256K tokens
Max output
128K tokens
Released
March 2026
Pricing
ChatGPT Plus / API
Key features
- Visible chain-of-thought tuned for hard, multi-step problems.
- Outperforms GPT-5.4 Instant on math, coding and research benchmarks.
- Built for extended professional workflows where quality > speed.
- Same safety stack and tool-use as the rest of GPT-5.4 family.
Best for
Pick GPT-5.4 Thinking when you have a hard problem that needs careful, multi-step reasoning and you can afford a few extra seconds of latency.
Frequently Asked Questions
How is GPT-5.4 Thinking different from GPT-5.5?
GPT-5.4 Thinking is the reasoning-tuned variant of GPT-5.4. GPT-5.5 is the newer, faster flagship that combines speed and intelligence.
When was it released?
GPT-5.4 Thinking was released in March 2026.
Open Chat
GPT-5.4 Thinking trades raw latency for deep, explicit reasoning steps, making it ideal for legal, financial, scientific and engineering work.