Compare / head-to-head
Claude Sonnet 5.5vs
Muse Spark 1.2
Claude Sonnet 5.5 leads 12 of 17 shared benchmarks. Muse Spark 1.2 is 2.2x cheaper per token. Muse Spark 1.2 has the larger context window (1.0M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
12 – 5
Claude Sonnet 5.5 leads
Cheaper per token
Muse Spark 1.2
2.2x cheaper, input + output
Larger context
Muse Spark 1.2
1.0M tokens
Providers
2 providers
Anthropic · Meta
Claude Sonnet 5.5
Anthropic · released 2026-09-28
textvision
Muse Spark 1.2
Meta · released 2026-08-05
textvisionvideoaudio
Quality
Benchmark matrix
17 shared · 12 only Claude Sonnet 5.5 · 6 only Muse Spark 1.2| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 17 | ||||
| LMArena Elo | 1471 ↗ | 1493.5 ↗ | -22.5 | Muse Spark 1.2 |
| APEX-Agents (Mercor) | 75.5% ↗ | 36.4% ↗ | +39.1 pt | Claude Sonnet 5.5 |
| FrontierSWE V2 (Proximal Labs) | 61.9% ↗ | 12% ↗ | +49.9 pt | Claude Sonnet 5.5 |
| LiveBench Agentic Coding (LiveBench) | 56.3% ↗ | 57.6% ↗ | -1.3 pt | Muse Spark 1.2 |
| LiveBench Coding (LiveBench) | 91.4% ↗ | 77.5% ↗ | +13.9 pt | Claude Sonnet 5.5 |
| LiveBench Data Analysis (LiveBench) | 78.6% ↗ | 76.5% ↗ | +2.1 pt | Claude Sonnet 5.5 |
| LiveBench Instruction Following (LiveBench) | 70.5% ↗ | 74.3% ↗ | -3.8 pt | Muse Spark 1.2 |
| LiveBench Language (LiveBench) | 83.4% ↗ | 78.6% ↗ | +4.8 pt | Claude Sonnet 5.5 |
| LiveBench Mathematics (LiveBench) | 96.7% ↗ | 91.2% ↗ | +5.5 pt | Claude Sonnet 5.5 |
| LiveBench Reasoning (LiveBench) | 91.6% ↗ | 90% ↗ | +1.6 pt | Claude Sonnet 5.5 |
| LMArena Agent (LMArena) | 0.1252 ↗ | -0.0327 ↗ | +0.2 | Claude Sonnet 5.5 |
| LMArena Vision (LMArena) | 1268.3 ↗ | 1292.8 ↗ | -24.5 | Muse Spark 1.2 |
| LMArena WebDev (LMArena) | 1786.3 ↗ | 1531.8 ↗ | +254.5 | Claude Sonnet 5.5 |
| SAGE (Vals AI) | 51.8% ↗ | 47.7% ↗ | +4.1 pt | Claude Sonnet 5.5 |
| SimpleBench (SimpleBench) | 75.9% ↗ | 74.5% ↗ | +1.4 pt | Claude Sonnet 5.5 |
| SimpleQA Verified | 46.5% ↗epoch run | 60.3% ↗epoch run | -13.8 pt | Muse Spark 1.2 |
| Terminal-Bench 4.0 (Vals AI) | 64.1% ↗ | 6.1% ↗ | +58 pt | Claude Sonnet 5.5 |
| Only Claude Sonnet 5.5 reports · 12 | ||||
| GPQA Diamond | 95.6% ↗epoch run | not reported | — | — |
| Chartography (no tools) | 61.6% ↗ | not reported | — | — |
| CursorBench 4.0 | 55.5% ↗ | not reported | — | — |
| FrontierCode v1.1 (Main) | 46.2% ↗ | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 80.5% ↗epoch run | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 88.8% ↗epoch run | not reported | — | — |
| Furniture Assembly (Epoch AI run) | 75% ↗epoch run | not reported | — | — |
| Humanity's Last Exam (with tools) | 64.5% ↗ | not reported | — | — |
| Mystery Game Puzzles (Epoch AI run) | 65% ↗epoch run | not reported | — | — |
| OSWorld 2.1 (partial) | 80.1% ↗ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch run | not reported | — | — |
| Terminal-Bench 4.0 | 70.6% ↗ | not reported | — | — |
| Only Muse Spark 1.2 reports · 6 | ||||
| DeepSWE v1.1 | not reported | 59.3% ↗ | — | — |
| DeepSWE v1.1 (Datacurve) | not reported | 54.9% ↗ | — | — |
| MCP Atlas | not reported | 90.3% ↗ | — | — |
| Terminal-Bench 2.1 | not reported | 82.9% ↗ | — | — |
| Toolathlon-Verified (HKUST) | not reported | 75.9% ↗ | — | — |
| WeirdML (Håvard Tveit Ihle) | not reported | 60.3% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Sonnet 5.5 minus Muse Spark 1.2 in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Sonnet 5.5 | Muse Spark 1.2 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1.0M tokens | Muse Spark 1.2 |
| Max output | 128K tokens | — | — |
| Input price / 1M | $2 ↗ | $1.25 ↗ | Muse Spark 1.2 |
| Output price / 1M | $10 ↗ | $4.25 ↗ | Muse Spark 1.2 |
| Cached input / 1M | $0.2 ↗ | $0.15 ↗ | Muse Spark 1.2 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12 | $5.5 | Muse Spark 1.2 |
| Modalities | text · vision | text · vision · video · audio | Muse Spark 1.2 |
| Released | 2026-09-28 | 2026-08-05 | — |
| Cited benchmark scores | 29 | 23 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Sonnet 5.5 vs …
Models sharing the most benchmarksMore matchups
Muse Spark 1.2 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Sonnet 5.5 and Muse Spark 1.2 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.