Claude Fable 5.1 vs Muse Spark 1.3
Claude Fable 5.1 scores higher on the Models at Work leaderboard (80 vs 72 out of 100). Muse Spark 1.3 is about 26× cheaper per blended million tokens ($0.78 vs $20, one figure an Artificial Analysis estimate). On Artificial Analysis' independent Intelligence Index, Claude Fable 5.1 leads 53 to 48.
| Claude Fable 5.1 · Anthropic | Muse Spark 1.3 · Meta | |
|---|---|---|
| Leaderboard rank | #6 | #8 |
| Score (0–100) | 80 | 72 |
| Tier | Frontier | Workhorse |
| Price per 1M tokens | $10 in · $50 out | $0.78 blended (estimate) |
| Context window | 1M | Not verified |
| Open weights | No | Not verified |
| Artificial Analysis Intelligence Index | 53 | 48 |
| Arena text score | 1501 | 1494 |
| Humanity's Last Exam, Diamond (Scale) | 51.3 | — |
| DistressBench (Scale) | — | 84.88 |
| Best for | Long-horizon agents, Problems Opus fails on, Demanding reasoning | Latency-first products, Customer-facing chat, Meta-ecosystem teams |
Choose Claude Fable 5.1 if…
- you need long-horizon agents
- you need problems opus fails on
- you need demanding reasoning
The specialist: Anthropic's own docs say to reach for it when Opus 5.5 at high effort still falls short, and the price says the same.
Caveats: Ten dollars per million input is the highest in this table alongside Astra.
Choose Muse Spark 1.3 if…
- you need latency-first products
- you need customer-facing chat
- you need meta-ecosystem teams
The fastest thing in the table by a distance, and the one to beat on the stress benchmark nobody else talks about.
Questions people ask
Which is better, Claude Fable 5.1 or Muse Spark 1.3?
Claude Fable 5.1 scores higher on the Models at Work leaderboard (80 vs 72 out of 100). Muse Spark 1.3 is about 26× cheaper per blended million tokens ($0.78 vs $20, one figure an Artificial Analysis estimate). On Artificial Analysis' independent Intelligence Index, Claude Fable 5.1 leads 53 to 48.
When should I choose Claude Fable 5.1 over Muse Spark 1.3?
Choose Claude Fable 5.1 for long-horizon agents, problems opus fails on, demanding reasoning. The specialist: Anthropic's own docs say to reach for it when Opus 5.5 at high effort still falls short, and the price says the same.
When should I choose Muse Spark 1.3 over Claude Fable 5.1?
Choose Muse Spark 1.3 for latency-first products, customer-facing chat, meta-ecosystem teams. The fastest thing in the table by a distance, and the one to beat on the stress benchmark nobody else talks about.
Which is cheaper, Claude Fable 5.1 or Muse Spark 1.3?
Claude Fable 5.1 costs $10 per million input tokens and $50 per million output tokens on Anthropic's list price (Claude pricing, read Oct 10, 2026). Meta does not publish a simple list price for Muse Spark 1.3; Artificial Analysis estimates a blended $0.78 per million tokens (three input to one output).
Scores come from the Models at Work leaderboard: Score is 0 to 100: 50% independent evals normalised within this table, 20% price-performance, 15% practitioner sentiment from Signals and community threads, 15% operational fit (context, speed, availability, open weights). Models within three points are a tie in practice. Vendor-published figures are labelled as such and never counted as independent. Prices are vendor list prices where published; blended figures assume three input tokens per output token.