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Claude Haiku 4.5 vs Muse Spark Open

Muse Spark Open leads the LLM Stats Score 44.9 to 25.5. Claude Haiku 4.5 and Muse Spark Open cost the same.

Anthropic · Meta · Updated for 2026

Which is better?

Muse Spark Open leads the overall LLM Stats Score 44.9 to 25.5, ranking #43 overall.

In the 1 individual benchmarks reported for both models, Muse Spark Open wins 1; this is a narrower head-to-head signal than the composite indexes.

Muse Spark Open also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Haiku 4.5

  • you want predictable pricing at $1.00/M input and $5.00/M output

Choose Muse Spark Open

  • overall performance matters — it scores 44.9 and ranks #43 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Oct 2026
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Claude Haiku 4.5
Anthropic
Muse Spark Open
Meta
Core performance indexes
LLM Stats Score
25.5
#177
44.9
#43
Reasoning
25.1
#175
45.2
#39
Coding
19.5
#118
33.0
#42
Agents
13.3
#114
30.6
#43
Cost, coverage & limits
Benchmark wins
0 of 1
1 of 1
Input price
$1.00 / M
$1.25 / M
Output price
$5.00 / M
$4.25 / M
Context window
200,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

4 shared
Index
Claude Haiku 4.5
Muse Spark Open
Math
15.6#225
31.6#69
Vision
8.6#153
31.2#34
Tool use
15.2#107
23.3#44
Multimodal
9.8#134
33.1#20
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

12 reported for Claude Haiku 4.5 · 17 for Muse Spark Open

1 shared

Claude Haiku 4.5 outperforms in 0 benchmarks, while Muse Spark Open is better at 1 benchmark (GPQA).

Muse Spark Open significantly outperforms across most benchmarks.

Mon Oct 19 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

For input processing, Claude Haiku 4.5 ($1.00/1M tokens) is 1.3x cheaper than Muse Spark Open ($1.25/1M tokens).

For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 1.2x more expensive than Muse Spark Open ($4.25/1M tokens).

In conclusion, Claude Haiku 4.5 and Muse Spark Open cost the same.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Mon Oct 19 2026 • llm-stats.com
Anthropic
Claude Haiku 4.5
Input tokens$1.00
Output tokens$5.00
Best providerAnthropic
Meta
Muse Spark Open
Input tokens$1.25
Output tokens$4.25
Best providerTogether
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Muse Spark Open accepts 1,048,576 input tokens compared to Claude Haiku 4.5's 200,000 tokens. Muse Spark Open can generate longer responses up to 1,048,576 tokens, while Claude Haiku 4.5 is limited to 64,000 tokens.

Anthropic
Claude Haiku 4.5
Input200,000 tokens
Output64,000 tokens
Meta
Muse Spark Open
Input1,048,576 tokens
Output1,048,576 tokens
Mon Oct 19 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Haiku 4.5 and Muse Spark Open support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Haiku 4.5

Text
Images
Audio
Video

Muse Spark Open

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Haiku 4.5 is licensed under a proprietary license, while Muse Spark Open uses Muse Model License.

License differences may affect how you can use these models in commercial or open-source projects.

Claude Haiku 4.5

Proprietary

Closed source

Muse Spark Open

Muse Model License

Open weights

Release Timeline

When each model was launched

Claude Haiku 4.5 was released on 2025-10-15, while Muse Spark Open was released on 2026-10-15.

Muse Spark Open is 12 months newer than Claude Haiku 4.5.

Claude Haiku 4.5

Oct 15, 2025

1.0 years ago

Muse Spark Open

Oct 15, 2026

2 days ago

1.0yr newer

Knowledge Cutoff

When training data ends

Claude Haiku 4.5 has a documented knowledge cutoff of 2025-02-01, while Muse Spark Open's cutoff date is not specified.

We can confirm Claude Haiku 4.5's training data extends to 2025-02-01, but cannot make a direct comparison without Muse Spark Open's cutoff date.

Claude Haiku 4.5

Feb 2025

Muse Spark Open

—

Provider Availability

Claude Haiku 4.5 is available from Anthropic, DeepInfra, Vertex AI. Muse Spark Open is available from Together.

Claude Haiku 4.5

anthropic logo
Anthropic
Input Price:Input: $1.00/1MOutput Price:Output: $5.00/1M
deepinfra logo
Deepinfra
Input Price:Input: $1.00/1MOutput Price:Output: $5.00/1M
vertex logo
Unknown Organization
Input Price:Input: $1.00/1MOutput Price:Output: $5.00/1M

Muse Spark Open

together logo
Together
Input Price:Input: $1.25/1MOutput Price:Output: $4.25/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Haiku 4.5 and Muse Spark Open side-by-side, then vote on the output you prefer.

Claude Haiku 4.5
✓ Preferred
Muse Spark Open
Open in Playground

FAQ

Common questions about Claude Haiku 4.5 vs Muse Spark Open.

Which is better, Claude Haiku 4.5 or Muse Spark Open?

Muse Spark Open leads the LLM Stats Score 44.9 to 25.5. Claude Haiku 4.5 is made by Anthropic and Muse Spark Open is made by Meta. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Haiku 4.5 compare to Muse Spark Open in benchmarks?

Claude Haiku 4.5 scores Tau2 Retail: 83.2%, MMMLU: 83.0%, Tau2 Telecom: 83.0%, AIME 2025: 80.7%, SWE-Bench Verified: 73.3%. Muse Spark Open scores MCP Atlas: 89.2%, GPQA: 89.0%, OSWorld-Verified: 80.4%, BabyVision: 80.2%, Terminal-Bench 2.1: 76.4%.

Is Claude Haiku 4.5 cheaper than Muse Spark Open?

Claude Haiku 4.5 is 1.3x cheaper for input tokens. Claude Haiku 4.5 costs $1.00/M input and $5.00/M output via anthropic. Muse Spark Open costs $1.25/M input and $4.25/M output via together.

What are the context window sizes for Claude Haiku 4.5 and Muse Spark Open?

Claude Haiku 4.5 supports 200K tokens and Muse Spark Open supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Haiku 4.5 and Muse Spark Open?

Key differences include LLM Stats Score (25.5 vs 44.9), context window (200K vs 1.0M), input pricing ($1.00 vs $1.25/M), licensing (Proprietary vs Muse Model License). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 4.5 and Muse Spark Open?

Claude Haiku 4.5 is developed by Anthropic and Muse Spark Open is developed by Meta.

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