Verified against platform.claude.com/docs/en/about-claude/models/overview — Verified: 2026-07-29. Reverify before next publish.
| Haiku 4.5 | Sonnet 5 | Opus 5 | Fable 5 | |
|---|---|---|---|---|
| Role | Fastest, near-frontier | Best speed/intelligence balance | Complex agentic coding, enterprise | Most capable, long-running agents |
| Context window | 200k | 1M | 1M | 1M |
| Thinking mode | Extended (manual budget) | Adaptive | Adaptive | Adaptive (always on) |
This is the only place in this module where exact model names and numbers appear. If you're reading this well after 2026-07-29, treat this table with appropriate skepticism and check the source link — the framework in Section 3 above will still hold even if these specifics have moved on.