GPT-5 Pro
GPT-5 Pro is OpenAI’s most advanced model, offering major improvements in reasoning, code quality, and user experience. It is optimized for complex tasks that require step-by-step reasoning, instruction following, and accuracy in high-stakes use cases. It supports test-time routing features and advanced prompt understanding, including user-specified intent like "think hard about this." Improvements include reductions in hallucination, sycophancy, and better performance in coding, writing, and he
Context window
This model accepts 400K tokens in one request (~300K words of text).
What fits in one request
- FitsShort documentAbout 1,500 words of text
- FitsLong documentAbout 37K words of text
- FitsSmall codebaseAbout 150K words of text
- Won't fitFull novelAbout 375K words of text
Specifications
Context size, pricing, and release info in one place.
- Context window
- 400,000 tokens (400K)
- Max output tokens
- 128,000 tokens (128K)
- Speed tier
- balanced
- Provider
- Openai
- Release date
- Oct 2025
Capabilities
See which features this model supports, such as vision, tools, and streaming.
- Vision
- Accepts image inputs alongside text
- Supported
- Tool use
- Can call external tools and APIs
- Supported
- Function calling
- Structured function call interface
- Supported
- Extended thinking
- Shows its chain-of-thought reasoning
- Supported
- Streaming
- Returns tokens as they are generated
- Supported
- Web search
- Can browse the web during a request
- Not supported
- Batch API
- Process many requests asynchronously
- Not supported
- Prompt caching
- Reuse repeated prompt prefixes cheaply
- Not supported
Best for
Jump to a guide or ranking that matches each workload.
Compare GPT-5 Pro
Open a side-by-side comparison with one click.
- GPT-5 Pro vs Amazon Titan Text Express
GPT-5 Pro has 852% larger context window
- GPT-5 Pro vs Amazon Titan Text Lite
GPT-5 Pro has 852% larger context window
- GPT-5 Pro vs Amazon Titan Text Premier
GPT-5 Pro has 852% larger context window
- GPT-5 Pro vs Claude Instant
GPT-5 Pro has 300% larger context window
- GPT-5 Pro vs Anthropic Claude
GPT-5 Pro has 300% larger context window
- GPT-5 Pro vs Codellama 34b Instruct
GPT-5 Pro has 9665% larger context window
Frequently asked questions
Short answers about context size and how this model behaves.
More from Openai
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