Muse Spark 1.1 vs Muse Spark 1.2
| Spec | Muse Spark 1.1 | Muse Spark 1.2 |
|---|---|---|
| Respan Index | 46.6 (#40) | 45.6 (#43) |
| Blended price per 1M | $2 | $2 |
| Context window | 1.0M | 1.0M |
| Input / output per 1M | $1.25 / $4.25 | $1.25 / $4.25 |
| Max output | - | - |
| Input | text, vision, video, audio | text, vision, video, audio |
| Released | 2026-07-09 | 2026-08-05 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | Muse Spark 1.1 | Muse Spark 1.2 |
|---|---|---|
| Coding | 26.3 Muse Spark 1.1 | 22.0 Muse Spark 1.2 |
| Agents | 57.7 Muse Spark 1.1 | 58.1 Muse Spark 1.2 |
| Reasoning | 48.1 Muse Spark 1.1 | 46.4 Muse Spark 1.2 |
| Knowledge & language | 54.1 Muse Spark 1.1 | 58.3 Muse Spark 1.2 |
| Human preference | 54.7 Muse Spark 1.1 | 54.5 Muse Spark 1.2 |
Benchmarks both report
Muse Spark 1.2 leads on 17 of the 20 benchmarks both report. Higher is better. Each score links to where it was published.
| Benchmark | Muse Spark 1.1 | Muse Spark 1.2 |
|---|---|---|
| Chess Puzzles (Epoch AI) | 34% | 27% |
| LMArena Agent (LMArena) | -0.0767 | -0.0754 |
| LMArena Elo | 1490 | 1492 |
| LMArena WebDev (LMArena) | 1543 | 1534 |
| LMArena Vision (LMArena) | 1280 | 1293 |
| APEX-Agents (Mercor) | 31.8% | 45.4% |
| DeepSWE v1.1 (Datacurve) | 53.3% | 54.9% |
| LiveBench Agentic Coding (LiveBench) | 58.5% | 57.6% |
| LiveBench Coding (LiveBench) | 77.2% | 77.5% |
| LiveBench Data Analysis (LiveBench) | 72.5% | 76.5% |
| LiveBench Instruction Following (LiveBench) | 69.6% | 74.3% |
| LiveBench Language (LiveBench) | 74.3% | 78.6% |
| LiveBench Mathematics (LiveBench) | 87.1% | 91.2% |
| LiveBench Reasoning (LiveBench) | 87.7% | 90% |
| SAGE (Vals AI) | 45.6% | 47.7% |
| SimpleQA Verified | 57.8% | 60.3% |
| DeepSWE v1.1 | 53.3% | 59.3% |
| MCP Atlas | 88.1% | 90.3% |
| Terminal-Bench 2.1 | 80% | 82.9% |
| Toolathlon-Verified (HKUST) | 75.6% | 75.9% |
FAQ
Is Muse Spark 1.1 better than Muse Spark 1.2?
Muse Spark 1.1 scores 46.6 on the Respan Index (#40), ahead of Muse Spark 1.2 at 45.6 (#43). Muse Spark 1.2 leads on 17 of the 20 benchmarks both report.
Which is cheaper, Muse Spark 1.1 or Muse Spark 1.2?
Muse Spark 1.1 lists at $1.25 input and $4.25 output per 1M tokens; Muse Spark 1.2 at $1.25 and $4.25. Both cost about the same per token at list price.
Which has the larger context window?
Both accept 1.0M tokens of context.