Claude Opus 5 vs Claude Fable 5
Source-checked evaluation entries, evidence gaps and checked price quotes where available.
Claude Opus 5
Claude Opus 5 (High). Board 2026-10-20; checked 2026-10-22.
Anthropic pricing · checked 2026-10-22. Context tiers and cache-hit rates may differ.
Claude Fable 5
Claude Fable 5 (High). Board 2026-10-20; checked 2026-10-22.
Anthropic pricing · checked 2026-10-22. Context tiers and cache-hit rates may differ.
What the evidence supports
The recorded entries are Claude Opus 5 (High) (1490 ± 4) and Claude Fable 5 (High) (1504 ± 4).
Their point estimates differ by 14 points. The displayed ranges do not overlap; this is not a test of task-specific superiority or a guarantee about a different configuration.
The former composite, MMLU and cost-per-capability recommendations are withdrawn because their inputs included unsupported estimates. No upgrade or overall capability recommendation is made from those numbers.
In the selected standard short-context input quotes, Claude Opus 5 has the lower rate, by a ratio of 2 to one. DeepSeek uses peak pricing. This is input pricing only; it does not estimate a whole workload or establish account access.
Price quotes are from the selected provider registry checked 2026-10-22. Unverified legacy quotes are withheld. Use the token calculator for input, output, cache-hit and context-tier scenarios. Additional service charges and account-specific terms can change a bill. Missing pricing evidence does not mean free inference.
Before choosing a deployment
Use the exact configuration you would deploy on a fixed set of representative tasks. Record accepted answers, failures, end-to-end latency and total metered cost. Check licensing, hosting options and data requirements directly with each provider. This is a proposed evaluation procedure; AI Mastery has not run a head-to-head workload test for this pairing.
The leaderboard records the verified variants and withheld columns. The separate benchmark matrix contains dated provider disclosures and needs its own source/version review.