Claude Opus 5 vs Fable 5: Which One in 2026?
The Short Answer
Default to Claude Opus 5 — it’s cheaper, broadly available, and tops the coding/agentic indexes. Reserve Claude Fable 5 for tasks where its frontier reasoning edge is worth double the price and the tighter plan access.
Head to Head
| Claude Opus 5 | Claude Fable 5 | |
|---|---|---|
| Launched | Jul 24, 2026 | 2026 (redeployed Jul 1) |
| Price (in/out) | $5 / $25 | $10 / $50 |
| 30K/5K task | ~$0.28 | ~$0.55 |
| SWE-bench Pro | 79.2% | high |
| Context | 1M | large |
| Sub access | Pro/Max/Team/Enterprise | Max / Team-Premium only (50% weekly cap) |
Why Opus 5 Is the Default
Opus 5 shipped July 24, 2026 at the same $5/$25 as Opus 4.8 but with a big capability jump: it tops the coding and agentic indexes, SWE-bench Pro 79.2%, ARC-AGI-3 ~30.2%, and leads GDPval knowledge-work Elo. It’s now the default Opus, with 1M context, 128K max output, and a lowered 512-token cache minimum.
When Fable 5 Earns Its Premium
Fable 5 remains a frontier reasoning model and on some indexes edges ahead on the very hardest reasoning. But it’s 2x the price and, since July 20, 2026, restricted to Max / Team-Premium plans with a 50% weekly cap. That combination makes it a specialist pick, not a default.
What to Do
- Default to Opus 5 for coding, agents, and general work.
- Escalate to Fable 5 only when a task clearly rewards its reasoning edge and you have plan access.
- Keep the model a config value so you can route per task.
Sources
- Anthropic — Claude Opus 5 (July 24, 2026): anthropic.com/news/claude-opus-5
- Vals.ai — SWE-bench leaderboard: vals.ai/benchmarks/swebench
- Artificial Analysis — model index: artificialanalysis.ai