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Step 5 PreviewClaude Fable 5 vs Muse Spark 1.1
- Claude Fable 5 rates higher on LMArena’s text leaderboard: 1491 against 1478.
- Muse Spark 1.1 is cheaper: $1.25 / $4.25 per million input / output tokens, against $10 / $50 for Claude Fable 5.
- On the 7 Vals AI benchmarks both have taken, Claude Fable 5 wins 7 and Muse Spark 1.1 wins 0.
LatestClaude Fable 5 1491Muse Spark 1.1 1478
Side by side
Models (2/6)
- Claude Fable 5
- Muse Spark 1.1
| Benchmark | Claude Fable 5 | Muse Spark 1.1 |
|---|---|---|
| The model | ||
| Lab | Anthropic | Meta |
| Released | 2026-06-09 | 2026-07-16 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Input, per 1M tokens | $10 | $1.25 |
| Output, per 1M tokens | $50 | $4.25 |
| LMArena, people’s votes | ||
| LMArena TextMillions of people compare two anonymous models side by side and vote for the better answer | 1491#12 of 351 | 1478#22 of 351 |
| LMArena WebDevPeople ask two anonymous models to build the same web app, try both and vote for the better one | 1624#24 of 124 | 1543#47 of 124 |
| LMArena VisionSide-by-side votes on prompts that include an image | 1325#1 of 146 | 1293#26 of 146 |
| LMArena CodingLMArena’s text votes on prompts that ask for code | 1518#10 of 346 | 1498#28 of 346 |
| LMArena MathLMArena’s text votes on math prompts | 1516#8 of 339 | 1481#33 of 339 |
| LMArena Creative writingLMArena’s text votes on stories, poems and other creative writing | 1493#6 of 349 | 1435#57 of 349 |
| LMArena Hard promptsLMArena’s text votes on the hardest prompts | 1507#10 of 351 | 1485#27 of 351 |
| LMArena Instruction followingLMArena’s text votes on prompts with specific instructions to follow | 1502#8 of 351 | 1456#45 of 351 |
| Vals AI, coding | ||
| Terminal-Bench 4.0Frontier-difficulty tasks an agent completes in a real terminal | 41.41%#12 of 55 | — |
| SWE-benchReal GitHub issues from open-source projects | 95.00%#7 of 85 | 82.00%#20 of 85 |
| Vibe Code BenchBuilding complete web apps from a plain-language brief, graded on whether the app works | 90.35%#4 of 115 | 72.16%#40 of 115 |
| LiveCodeBenchFresh competitive programming problems, collected after models’ training cut-offs to avoid contamination | 89.78%#2 of 143 | 85.91%#29 of 143 |
| Vals AI, finance | ||
| Tax Agent BenchAgentic research into US corporate tax questions | 38.28%#11 of 76 | — |
| Vals AI, law | ||
| Legal Research BenchAgentic US legal research | 49.52%#8 of 85 | 37.98%#39 of 85 |
| Vals AI, medicine | ||
| MedCodeAssigning the right medical billing codes from clinical notes | 56.07%#4 of 107 | — |
| Vals AI, reasoning | ||
| GPQA DiamondGraduate-level questions in biology, physics and chemistry that experts answer well and search does not | 93.18%#10 of 138 | 91.16%#23 of 138 |
| MMLU-ProHarder, reasoning-focused multiple choice across 14 subjects, from law to engineering | 91.50%#3 of 138 | 88.73%#17 of 138 |
| MMMUCollege-level questions that need both an image and text | 89.31%#3 of 93 | 86.59%#18 of 93 |
| Terminal-Bench ScienceExpert-written scientific research workflows, run by an agent in a terminal | 15.71%#12 of 42 | — |
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Questions
Which is better, Claude Fable 5 or Muse Spark 1.1?
Claude Fable 5 rates higher on LMArena’s text leaderboard: 1491 against 1478. Muse Spark 1.1 is cheaper: $1.25 / $4.25 per million input / output tokens, against $10 / $50 for Claude Fable 5. On the 7 Vals AI benchmarks both have taken, Claude Fable 5 wins 7 and Muse Spark 1.1 wins 0.
Which is cheaper, Claude Fable 5 or Muse Spark 1.1?
Muse Spark 1.1 is cheaper: $1.25 / $4.25 per million input / output tokens, against $10 / $50 for Claude Fable 5.