chatbots
Copilot StudioMicrosoft Copilot Studio Review 2026 — Enterprise AI Agent Building
Build custom AI assistants and autonomous agents integrated into Microsoft 365.
Independent
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Claude Fable 5
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The new standard of "Mythos-Class" intelligence with deep autonomous reasoning.
- New model utilizing frontier "Mythos-Class" intelligence
- 1 million token input context window
- Record-breaking 80.3% score on SWE-bench Pro
- Extended output capacity of up to 128,000 tokens
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ChatGPT-5.5
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Flagship intelligence with GPT-5.5 and ultra-fast GPT-5.5 Instant.
- Flagship GPT-5.5 with massive logical, math, and code generation improvements
- GPT-5.5 Instant offering high-volume tasks under 50ms latency
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Claude Sonnet 4.5
4.9·Freemium
Editor's choice
The assistant with the best long-context reasoning on the market.
- 200K-token context, no drift
- Beats GPT-4o on long analytical tasks
- Artifacts: edits code and docs live
- Generous Pro plan usage limits