Models, measured side by side
Claude Opus 5.5 vs Muse Spark 1.3
Compare Claude Opus 5.5, Muse Spark 1.3 by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
Claude Opus 5.5
$180 / mo
Muse Spark 1.3
$46 / mo
Performance comparison
Claude Opus 5.5
57.6
Muse Spark 1.3
48.1
Overview
Pricing & capacity
| Pricing & capacity | Claude Opus 5.5 | Muse Spark 1.3 |
|---|---|---|
| Input / 1M tokens | $4.00 | $1.25 |
| Output / 1M tokens | $20 | $4.25 |
| Cached input / 1M | $0.20 | $0.15 |
| Monthly cost | $180 | $46 |
| Context window | 1M | 1M |
| Maximum output | 128K | 944K |
Input / 1M tokens
- Claude Opus 5.5
- $4.00
- Muse Spark 1.3
- $1.25
Output / 1M tokens
- Claude Opus 5.5
- $20
- Muse Spark 1.3
- $4.25
Cached input / 1M
- Claude Opus 5.5
- $0.20
- Muse Spark 1.3
- $0.15
Monthly cost
- Claude Opus 5.5
- $180
- Muse Spark 1.3
- $46
Context window
- Claude Opus 5.5
- 1M
- Muse Spark 1.3
- 1M
Maximum output
- Claude Opus 5.5
- 128K
- Muse Spark 1.3
- 944K
Benchmarks & performance
| Benchmarks & performance | Claude Opus 5.5 | Muse Spark 1.3 |
|---|---|---|
| Arena Elo | Not listed | Not listed |
| MMLU-Pro | Not listed | Not listed |
| Intelligence Index | 57.6 | 48.1 |
| GPQA | Not listed | 93.5% |
| Humanity’s Last Exam | 61.4% | 48.7% |
| SciCode | 66.9% | 58.8% |
| Output speed | 91 tokens/s | 146 tokens/s |
| Time to first token | 755.54 s | 47.86 s |
| DesignArena rating | 1,407 | 1,358 |
| DesignArena win rate | 65.3% | 57.3% |
Arena Elo
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- Not listed
MMLU-Pro
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- Not listed
Intelligence Index
- Claude Opus 5.5
- 57.6
- Muse Spark 1.3
- 48.1
GPQA
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- 93.5%
Humanity’s Last Exam
- Claude Opus 5.5
- 61.4%
- Muse Spark 1.3
- 48.7%
SciCode
- Claude Opus 5.5
- 66.9%
- Muse Spark 1.3
- 58.8%
Output speed
- Claude Opus 5.5
- 91 tokens/s
- Muse Spark 1.3
- 146 tokens/s
Time to first token
- Claude Opus 5.5
- 755.54 s
- Muse Spark 1.3
- 47.86 s
DesignArena rating
- Claude Opus 5.5
- 1,407
- Muse Spark 1.3
- 1,358
DesignArena win rate
- Claude Opus 5.5
- 65.3%
- Muse Spark 1.3
- 57.3%
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Tools & features
| Tools & features | Claude Opus 5.5 | Muse Spark 1.3 |
|---|---|---|
| Function calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Built-in web search | Not listed | Not listed |
| Log probabilities | Not listed | Not listed |
| Deterministic seed | Not listed | Not listed |
| Parallel tool calls | Not listed | Not listed |
| Prompt caching | Supported | Supported |
Function calling
- Claude Opus 5.5
- Supported
- Muse Spark 1.3
- Supported
Structured outputs
- Claude Opus 5.5
- Supported
- Muse Spark 1.3
- Supported
JSON mode
- Claude Opus 5.5
- Supported
- Muse Spark 1.3
- Supported
Reasoning
- Claude Opus 5.5
- Supported
- Muse Spark 1.3
- Supported
Built-in web search
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- Not listed
Log probabilities
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- Not listed
Deterministic seed
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- Not listed
Parallel tool calls
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- Not listed
Prompt caching
- Claude Opus 5.5
- Supported
- Muse Spark 1.3
- Supported
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API & availability
| API & availability | Claude Opus 5.5 | Muse Spark 1.3 |
|---|---|---|
| API identifier | claude-opus-5.5 | muse-spark-1.3 |
| API providers | Not listed | Not listed |
| Knowledge cutoff | Not listed | Not listed |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- Claude Opus 5.5
claude-opus-5.5- Muse Spark 1.3
muse-spark-1.3
API providers
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- Not listed
Knowledge cutoff
- Claude Opus 5.5
- Not listed
- Muse Spark 1.3
- Not listed
Prices checked
- Claude Opus 5.5
- Oct 8, 2026
- Muse Spark 1.3
- Oct 8, 2026
About the models
Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Full pricing & detailsMuse Spark 1.3
Muse Spark 1.3 is a multimodal reasoning model from Meta for long-running agentic, multi-agent, and coding workflows. It is designed to keep track of information across extended tasks, work through...
Full pricing & detailsComparison FAQ
Claude Opus 5.5: $4.00 input and $20 output per million tokens. Muse Spark 1.3: $1.25 input and $4.25 output per million tokens. The cheaper choice depends on your input-to-output ratio; a model can have a lower input rate but a higher output rate.