GPT-5.1 Instant
OpenAI's previous flagship with adaptive reasoning. Best for writing with a warmer, more natural tone. 75% cheaper input and 60% cheaper output than GPT-4o.
Pricing
Ratings
Pros
- Fast responses with adaptive reasoning
- New personalization presets
- Strong math and coding improvements
- Multimodal (text, image, audio)
- Free tier available
Cons
- Coding not as strong as Claude Opus
- Can be verbose
- Writing style less natural than Claude
Benchmark Results
Best For
General assistant, math problems, quick coding help
Quick Info
- Provider
- OpenAI
- Version
- 5.1
- Released
- Nov 2025
- Context
- 128K tokens
Features
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