Pairwise benchmark snapshot · Aug 16, 2026
This page compares Claude Fable 5 (Anthropic) and Claude Opus 4.5 (Anthropic) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Fable 5 is ahead by 48 points (1,616 vs 1,568; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, Claude Fable 5 resolves 80% versus 76.8% (seed-bootstrap (Aug 16, 2026)). Claude Opus 4.5 streams faster (62 tok/s) while Claude Opus 4.5 is the cheaper output token ($25/1M). Claude Fable 5 has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.
Anthropic
Claude Fable 5Anthropic top-tier long-horizon model. Official API $10/$50 per 1M tokens (Claude Platform pricing, Aug 2026).
Anthropic
Claude Opus 4.5Anthropic frontier coding and computer-use model. SWE-bench leader on the official mini-SWE-agent harness in the Feb 2026 refresh.
Instant pairwise benchmark recalculation across 400+ LLMs
Category wins across intelligence, speed, and pricing efficiency.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
48 pts advantage
4 tok/s faster
$25.00/1M cheaper
Simulate monthly production API costs based on published $/1M tokens.
Claude Opus 4.5 is estimated to save $550.00/month ($6,600/year).
Higher SWE-bench (80%).
Lower output list price ($25/1M).
Lower TTFT (340 ms).
Larger window (1M).
Both accept images. Defaulting to the higher-Elo side (Claude Fable 5).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Claude Fable 5 | Higher SWE-bench (80%). |
| High-volume chat | Claude Opus 4.5 | Lower output list price ($25/1M). |
| Voice / low-latency UI | Claude Fable 5 | Lower TTFT (340 ms). |
| Long-document RAG | Claude Fable 5 | Larger window (1M). |
| Screenshots / vision | Claude Fable 5 | Both accept images. Defaulting to the higher-Elo side (Claude Fable 5). |
Fable 5 is not Sonnet with extra adjectives. It is the expensive long-horizon row. Read SWE-bench and output price together.
The Feb refresh made 4.5 a coding reference. Newer Opus SKUs exist; this row stays as the dated harness point.
No comments posted on this matchup yet. Be the first to share an evaluation note!
The real PNG is generated at /compare/claude-fable-5-vs-claude-opus-4-5/opengraph-image for crawlers.
Verified head-to-head card
