The Best Large Language Model for x
Last updated September 4, 2026.
- General chat, breadth of knowledge in the humanities and STEM: Claude Fable 5.1, for its reasoning and overall intelligence. Fable 5.1 is the best model for knowledge work. Runner-up: GPT-5.6 Sol in ChatGPT. GPT-5.6 Sol hallucinates more than even Opus 5 (it fails my economics benchmark) and has a worse writing style, but is quite intelligent. GPT-6 Astra is unavailable in ChatGPT beyond the Pro model, which has very limited queries.
- Coding, agentic work, and tool-calling through the native harnesses: Claude Fable 5.1, due to its exceptional post-training and coding style. Fable 5.1 is the only model that writes mergeable code. Runner-up: GPT-6 Astra, due to the great Codex harness and product.
- Web search: Claude Fable 5.1, due to its proficiency in reasoning over the data it finds on the web. Runner-up: GPT-5.6 Sol in ChatGPT, by virtue of Gemini’s incompetence.
- Fact-based medium- to long-context retrieval (PDFs and plain text): Claude Fable 5.1, due to its reasoning traces and overall intelligence. Runner-up: Gemini 3.8 Flash Extended, due to its massive context window and native multimodality.*
- Reasoning-based medium- to long-context analysis (PDFs and plain text): Claude Fable 5.1, due to its reasoning traces. Runner-up: Gemini 3.8 Flash Extended, due to its context window and multimodality.*
- Image analysis: GPT-5.6 Sol — OpenAI has improved image analysis substantially in this model. Runner-up: Claude Fable 5.1, for its reasoning and overall knowledge. Gemini 3.8 Flash provides more inference and image uploads every five hours on the $20 plan, but isn’t the best at reasoning.
* Gemini is still better at retrieving and interpreting data across long contexts, while Claude is better at reasoning over it. Use Claude when you need to work with it to accomplish a difficult task; use Gemini for “fancy Command-F.” Both are equivalent in PDF analysis, so long as the PDFs are pre-OCR’d — otherwise, Gemini has the edge. Both models are more proficient than GPT-5.6 Sol in ChatGPT.