Claude Sonnet 5.5 vs Muse Wonder.
Verdict by category, tale of the tape, shared benchmarks only, and cost at three workloads — all from the tracked data.
Verdict by category
| Category | Claude Sonnet 5.5 | Muse Wonder | Winner |
|---|---|---|---|
| League Score | 86.9 | 76.4 | Claude Sonnet 5.5 |
| Coding (SWE-bench %) | — | — | — |
| Reasoning (GPQA %) | — | — | — |
| Context (tokens) | 1000000 | 1048576 | Muse Wonder |
| Speed (tok/s) | — | — | — |
| Price (blended $/1M) | $4.00 | $8.00 | Claude Sonnet 5.5 (cheaper) |
Tale of the tape
| Spec | Claude Sonnet 5.5 | Muse Wonder |
|---|---|---|
| Maker | Anthropic | Meta |
| Released | Sep 28, 2026 | Oct 12, 2026 |
| League Score | 87 | 76 |
| Context | 1,000,000 tokens | 1,048,576 tokens |
| Max output | 128,000 | — |
| $/1M input | $2.00 | $4.00 |
| $/1M output | $10.00 | $20.00 |
| Weights | Closed | Closed |
| Speed | — | — |
Head-to-head benchmarks (shared only)
| Benchmark | Claude Sonnet 5.5 | Muse Wonder |
|---|---|---|
| LiveBench overall | 82.5 | 78.1 |
Cost at three workloads
| Workload | Claude Sonnet 5.5 | Muse Wonder |
|---|---|---|
| Light — 1M in / 250K out | $4.50 | $9.00 |
| Standard — 10M in / 2.5M out | $45.00 | $90.00 |
| Long-context — 50M in / 5M out | $150.00 | $300.00 |
The pick
Pick Claude Sonnet 5.5 if you want the higher overall League Score; you want the lower running cost.
Pick Muse Wonder if you need the bigger context window.
All figures from the model database — sources and dates on each model page. Cost your own workload or compare a different pair.
Frequently asked questions
Which is better overall, Claude Sonnet 5.5 or Muse Wonder?
Claude Sonnet 5.5 leads on overall League Score, 87 to 76 — a gap of 10 points on a composite of sourced benchmarks. That is overall form, not every category: check the per-category verdicts before choosing.
Which is cheaper, Claude Sonnet 5.5 or Muse Wonder?
Claude Sonnet 5.5 is cheaper: $4.00 vs $8.00 blended per 1M tokens (3:1 input/output mix) — about 2.0x less per token.
Which has the bigger context window, Claude Sonnet 5.5 or Muse Wonder?
Muse Wonder, with 1M of context against 1M for Claude Sonnet 5.5.
Are Claude Sonnet 5.5 and Muse Wonder open source?
Claude Sonnet 5.5 is closed weights — API access only; Muse Wonder is closed weights — API access only.