Claude Haiku 5.5 vs Muse Ember
Claude Haiku 5.5 leads Muse Ember on coding, 68.4 to 64.9 on the Vibe Coding Index, at about the same output price ($0.50 vs $0.50 per million). Updated November 14, 2026; 15 benchmarks have a result for both.
vs boards won of 15 shared
Claude Haiku 5.5 or Muse Ember: which to pick
Pick Claude Haiku 5.5 for coding: it scores 68.4 on the Vibe Coding Index against 64.9 for Muse Ember.
Pick Muse Ember for a larger context window (1.05M against 1M tokens) and work measured by LMArena WebDev or Terminal-Bench 4 (Vals AI), where it leads.
Model AClaude Haiku 5.5Anthropic68.4/1005 independent benchmarksNo cost per solved taskModel BMuse EmberMeta64.9/1003 independent benchmarksNo cost per solved task
- Shared results
- 15
- Claude Haiku 5.5 only
- 92
- Muse Ember only
- 0
- Like-for-like categories
- 5 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
Claude Haiku 5.5
Claude Haiku 5.5 scores 68.4 against 64.9.
5 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Claude Haiku 5.5 has a AA Intelligence Index result, 36.5.
Directional only
Web design
Design Arena: websites
No call
Only Claude Haiku 5.5 has a Design Arena: websites result, 1253.
Directional only
General
Vals Index
Muse Ember
Muse Ember leads, 60.5% against 58.7%.
Same board, both measured
Long documents
Listed context window
Muse Ember
Muse Ember takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
No call
Claude Haiku 5.5 $0.0003, Muse Ember $0.0003 per turn.
List prices
At a glance
- Coding index
- Claude Haiku 5.5 68.4 from 5 benchmarks, Muse Ember 64.9 from 3 benchmarks.
- Widest category
- Agentic work, 10.2 points apart on average over 4 shared benchmarks.
- Widest single gap
- Harvey's Legal Agent Benchmark (Vals AI): Claude Haiku 5.5 4.2% against Muse Ember 25.0%, 20.8 points apart on a 0 to 100 scale.
- Output price
- Both cost $0.50 per million output tokens.
- Context window
- Claude Haiku 5.5 takes 1M tokens, Muse Ember 1.05M.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Claude Haiku 5.5 | Bars | Muse Ember | Ties |
|---|---|---|---|---|
| Coding | 2 | 5 | ||
| Agentic work | 0 | 4 | ||
| Reasoning | 2 | 0 | ||
| Knowledge | 1 | 0 | ||
| General | 0 | 1 | ||
| All shared boards | 5 | 10 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index25
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| LiveBench coding | 77.6% | Not measured | Only Claude Haiku 5.5 measured |
| LMArena WebDev | 1593 | 1609 | Muse Ember |
| Terminal-Bench 4 (Vals AI) | 36.4% | 39.4% | Muse Ember |
| Vibe Code Bench (Vals AI) | 90.4% | 83.7% | Claude Haiku 5.5 |
| Code migration (Vals AI) | 44.6% | Not measured | Only Claude Haiku 5.5 measured |
| ProgramBench (Vals AI) | 2.5% | Not measured | Only Claude Haiku 5.5 measured |
| IOI (Vals AI) | 47.3% | Not measured | Only Claude Haiku 5.5 measured |
| SWE-bench Multimodal (Vals AI) | 44.0% | Not measured | Only Claude Haiku 5.5 measured |
| Vibe Code Bench 1-100 (Vals AI) | 20.4% | Not measured | Only Claude Haiku 5.5 measured |
| CyberBench (Vals AI) | 75.5% | Not measured | Only Claude Haiku 5.5 measured |
| SciCode | 55.0% | Not measured | Only Claude Haiku 5.5 measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 32.8% | 40.9% | Muse Ember |
| FrontierCode 2.0 | 34.9% | 27.2% | Claude Haiku 5.5 |
| FrontierCode | 46.4% | Not measured | Only Claude Haiku 5.5 measured |
| FrontierSWE | 43.8% | Not measured | Only Claude Haiku 5.5 measured |
| MirrorCode | 78.9% | Not measured | Only Claude Haiku 5.5 measured |
| ALE-Bench | 1587.0 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: coding | 1454 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: software and IT | 1443 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena WebDev: React | 1615 | 1616 | Muse Ember |
| LMArena WebDev: HTML | 1564 | 1621 | Muse Ember |
| SciCode | 9.2% | Not measured | Only Claude Haiku 5.5 measured |
| SWE-Bench Pro V2 | 87.2% | Not measured | Only Claude Haiku 5.5 measured |
| GameBench 2 | 75.1 | Not measured | Only Claude Haiku 5.5 measured |
| Terminal-Bench 4.0 | 40.0% | Not measured | Only Claude Haiku 5.5 measured |
| CursorBench 4.0 | 48.4% | Not measured | Only Claude Haiku 5.5 measured |
| Neither model has a result on the other 26 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| AA Intelligence Index | 36.5 | Not measured | Only Claude Haiku 5.5 measured |
| Epoch Capabilities Index | 160.4 | Not measured | Only Claude Haiku 5.5 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| LiveBench research | 84.3% | Not measured | Only Claude Haiku 5.5 measured |
| LiveBench browser | 69.5% | Not measured | Only Claude Haiku 5.5 measured |
| LiveBench long agentic | 47.9% | Not measured | Only Claude Haiku 5.5 measured |
| SREBench (Vals AI) | 5.7% | Not measured | Only Claude Haiku 5.5 measured |
| Finance Agent (Vals AI) | 54.1% | Not measured | Only Claude Haiku 5.5 measured |
| Tax Agent Bench (Vals AI) | 31.9% | 38.2% | Muse Ember |
| Legal Research Bench (Vals AI) | 43.8% | 49.0% | Muse Ember |
| Harvey's Legal Agent Benchmark (Vals AI) | 4.2% | 25.0% | Muse Ember |
| Excel Modeling Benchmark (Vals AI) | 59.0% | Not measured | Only Claude Haiku 5.5 measured |
| BioMysteryBench (Vals AI) | 70.4% | Not measured | Only Claude Haiku 5.5 measured |
| Terminal-Bench-Science (Vals AI) | 10.0% | Not measured | Only Claude Haiku 5.5 measured |
| Vals Science Index | 38.5% | Not measured | Only Claude Haiku 5.5 measured |
| APEX-Agents | 56.1% | 64.3% | Muse Ember |
| Vending-Bench 2 | $3,602 | Not measured | Only Claude Haiku 5.5 measured |
| Neither model has a result on the other 30 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| LiveBench reasoning | 82.4% | Not measured | Only Claude Haiku 5.5 measured |
| MysteryMechanism (Vals AI) | 35.1% | Not measured | Only Claude Haiku 5.5 measured |
| Humanity's Last Exam (Artificial Analysis run) | 44.4% | Not measured | Only Claude Haiku 5.5 measured |
| HLE-Diamond (Artificial Analysis run) | 29.6% | 25.1% | Claude Haiku 5.5 |
| CritPt v2, hard subset (Artificial Analysis run) | 47.5% | 39.0% | Claude Haiku 5.5 |
| GPQA Diamond (Epoch AI run) | 89.6% | Not measured | Only Claude Haiku 5.5 measured |
| ARC-AGI | 89.0% | Not measured | Only Claude Haiku 5.5 measured |
| ARC-AGI-2 | 61.3% | Not measured | Only Claude Haiku 5.5 measured |
| Chess puzzles | 55.0% | Not measured | Only Claude Haiku 5.5 measured |
| Mystery game puzzles | 30.0% | Not measured | Only Claude Haiku 5.5 measured |
| EBR-bench | 43.8% | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: hard prompts | 1418 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: expert | 1443 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: hard prompts in English | 1422 | Not measured | Only Claude Haiku 5.5 measured |
| Neither model has a result on the other 12 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| OTIS Mock AIME | 98.9% | Not measured | Only Claude Haiku 5.5 measured |
| FrontierMath, tiers 1 to 3 | 75.1% | Not measured | Only Claude Haiku 5.5 measured |
| FrontierMath, tier 4 | 46.3% | Not measured | Only Claude Haiku 5.5 measured |
| ProofBench | 89.0% | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: math | 1436 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: mathematical work | 1437 | Not measured | Only Claude Haiku 5.5 measured |
| Neither model has a result on the other 8 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| MedCode (Vals AI) | 51.5% | Not measured | Only Claude Haiku 5.5 measured |
| AA-Omniscience | 12.3 | 7.7 | Claude Haiku 5.5 |
| SimpleQA Verified | 23.8% | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: science | 1411 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: medicine and healthcare | 1367 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: legal and government | 1389 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: business and finance | 1400 | Not measured | Only Claude Haiku 5.5 measured |
| FACTS Benchmark Suite | 47.3% | Not measured | Only Claude Haiku 5.5 measured |
| Neither model has a result on the other 13 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| Design Arena: websites | 1253 | Not measured | Only Claude Haiku 5.5 measured |
| Design Arena: UI components | 1271 | Not measured | Only Claude Haiku 5.5 measured |
| Design Arena: game dev | 1316 | Not measured | Only Claude Haiku 5.5 measured |
| Design Arena: data viz | 1277 | Not measured | Only Claude Haiku 5.5 measured |
| Design Arena: 3D | 1321 | Not measured | Only Claude Haiku 5.5 measured |
| Design Arena: all code categories | 1278 | Not measured | Only Claude Haiku 5.5 measured |
| Design Arena: SVG | 1193 | Not measured | Only Claude Haiku 5.5 measured |
| Design Arena: ASCII art | 1210 | Not measured | Only Claude Haiku 5.5 measured |
| LiveBench design | 79.3% | Not measured | Only Claude Haiku 5.5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| Vals Index | 58.7% | 60.5% | Muse Ember |
| LiveBench data analysis | 53.1% | Not measured | Only Claude Haiku 5.5 measured |
| Public Benefits Bench (Vals AI) | 63.2% | Not measured | Only Claude Haiku 5.5 measured |
| SAGE (Vals AI) | 89.8% | Not measured | Only Claude Haiku 5.5 measured |
| MedScribe (Vals AI) | 89.5% | Not measured | Only Claude Haiku 5.5 measured |
| Long context reasoning (AA-LCR) | 82.7% | Not measured | Only Claude Haiku 5.5 measured |
| GDPval-AA | 1629 | Not measured | Only Claude Haiku 5.5 measured |
| DTBench | 95.0% | Not measured | Only Claude Haiku 5.5 measured |
| LMCA | 51.1% | Not measured | Only Claude Haiku 5.5 measured |
| Furniture assembly | 47.5% | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text | 1398 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: instruction following | 1411 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: creative writing | 1337 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: English | 1406 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: non-English | 1385 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: Chinese | 1433 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: German | 1429 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: Japanese | 1374 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: Korean | 1382 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: French | 1427 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: Spanish | 1397 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: Russian | 1377 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: Polish | 1378 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: multi-turn | 1388 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: longer queries | 1395 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: writing and language | 1369 | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text: entertainment and media | 1351 | Not measured | Only Claude Haiku 5.5 measured |
| MultiChallenge | 67.7% | Not measured | Only Claude Haiku 5.5 measured |
| Neither model has a result on the other 21 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Haiku 5.5 | Muse Ember | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Claude Haiku 5.5$0.0003Fits in one request
Muse Ember$0.0003Fits in one request
Same cost
Repository review
50K input + 3K output tokens
Claude Haiku 5.5$0.0065Fits in one request
Muse Ember$0.0065Fits in one request
Same cost
Agent loop
200K input + 10K output tokens
Claude Haiku 5.5$0.025Fits in one request
Muse Ember$0.025Fits in one request
Same cost
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Anthropic Claude Haiku 5.5 | Meta Muse Ember |
|---|---|---|
| Maker | Anthropic | Meta |
| Weights | No public weights listed | No public weights listed |
| Released | October 7, 2026 | November 9, 2026 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $0.10 | $0.10 |
| Output $/Mtok | $0.50 | $0.50 |
| Coding index | 68.4 | 64.9 |
| Independent measurements behind it | 5 | 3 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Haiku 5.5 better than Muse Ember for coding?
Pick Claude Haiku 5.5 for coding: it scores 68.4 on the Vibe Coding Index against 64.9 for Muse Ember. Pick Muse Ember for a larger context window (1.05M against 1M tokens) and work measured by LMArena WebDev or Terminal-Bench 4 (Vals AI), where it leads.
Which is cheaper, Claude Haiku 5.5 or Muse Ember?
Claude Haiku 5.5 costs $0.10 per million input tokens and $0.50 per million output tokens; Muse Ember costs $0.10 and $0.50. Cost per solved task is known for neither of them.
Which has the bigger context window, Claude Haiku 5.5 or Muse Ember?
Muse Ember, with 1.05M tokens against 1M.
How many benchmarks is the Claude Haiku 5.5 vs Muse Ember comparison based on?
15 benchmarks have a result for both models as of November 14, 2026. Claude Haiku 5.5's coding index rests on 5 independent benchmarks and Muse Ember's on 3. Where only one model has a result, the page says so instead of naming a winner.