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
Related Tools
Claude Opus 4.5
Anthropic's most powerful model, first to break 80% on SWE-bench Verified (80.9%). Best in the world for coding and autonomous agents. Features an effort parameter for speed vs thoroughness tradeoffs.
Claude Sonnet 4.5
Anthropic's best value model with 70% SWE-bench. 0% error rate on internal code editing benchmarks. Best price-to-performance ratio for most use cases.
GPT-5.1 Thinking
OpenAI's advanced reasoning model. Varies thinking time dynamically based on task complexity. Twice as fast on simple tasks, twice as thorough on complex ones.
Gemini 3 Pro
Google's flagship model, first to break 1500 Elo on LMArena (1501). Best for math (95% AIME 2025) and reasoning. 1M+ token context window.