Models, measured side by side
GPT-6 Astra vs Muse Spark 1.3
Compare GPT-6 Astra, Muse Spark 1.3 by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
GPT-6 Astra
$450 / mo
Muse Spark 1.3
$46 / mo
Performance comparison
GPT-6 Astra
52.7
Muse Spark 1.3
48.1
Overview
Pricing & capacity
| Pricing & capacity | GPT-6 Astra | Muse Spark 1.3 |
|---|---|---|
| Input / 1M tokens | $10 | $1.25 |
| Output / 1M tokens | $50 | $4.25 |
| Cached input / 1M | $1.00 | $0.15 |
| Monthly cost | $450 | $46 |
| Context window | 1.1M | 1M |
| Maximum output | 128K | 944K |
Input / 1M tokens
- GPT-6 Astra
- $10
- Muse Spark 1.3
- $1.25
Output / 1M tokens
- GPT-6 Astra
- $50
- Muse Spark 1.3
- $4.25
Cached input / 1M
- GPT-6 Astra
- $1.00
- Muse Spark 1.3
- $0.15
Monthly cost
- GPT-6 Astra
- $450
- Muse Spark 1.3
- $46
Context window
- GPT-6 Astra
- 1.1M
- Muse Spark 1.3
- 1M
Maximum output
- GPT-6 Astra
- 128K
- Muse Spark 1.3
- 944K
Benchmarks & performance
| Benchmarks & performance | GPT-6 Astra | Muse Spark 1.3 |
|---|---|---|
| Arena Elo | 1,288 | Not listed |
| MMLU-Pro | 88.3% | Not listed |
| Intelligence Index | 52.7 | 48.1 |
| GPQA | 96.1% | 93.5% |
| Humanity’s Last Exam | 54.7% | 48.7% |
| SciCode | 56.5% | 58.8% |
| Output speed | 60 tokens/s | 146 tokens/s |
| Time to first token | 287.74 s | 47.86 s |
| DesignArena rating | 1,384 | 1,358 |
| DesignArena win rate | 64.8% | 57.3% |
Arena Elo
- GPT-6 Astra
- 1,288
- Muse Spark 1.3
- Not listed
MMLU-Pro
- GPT-6 Astra
- 88.3%
- Muse Spark 1.3
- Not listed
Intelligence Index
- GPT-6 Astra
- 52.7
- Muse Spark 1.3
- 48.1
GPQA
- GPT-6 Astra
- 96.1%
- Muse Spark 1.3
- 93.5%
Humanity’s Last Exam
- GPT-6 Astra
- 54.7%
- Muse Spark 1.3
- 48.7%
SciCode
- GPT-6 Astra
- 56.5%
- Muse Spark 1.3
- 58.8%
Output speed
- GPT-6 Astra
- 60 tokens/s
- Muse Spark 1.3
- 146 tokens/s
Time to first token
- GPT-6 Astra
- 287.74 s
- Muse Spark 1.3
- 47.86 s
DesignArena rating
- GPT-6 Astra
- 1,384
- Muse Spark 1.3
- 1,358
DesignArena win rate
- GPT-6 Astra
- 64.8%
- Muse Spark 1.3
- 57.3%
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Tools & features
| Tools & features | GPT-6 Astra | 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 | Supported | Not listed |
| Parallel tool calls | Not listed | Not listed |
| Prompt caching | Supported | Supported |
Function calling
- GPT-6 Astra
- Supported
- Muse Spark 1.3
- Supported
Structured outputs
- GPT-6 Astra
- Supported
- Muse Spark 1.3
- Supported
JSON mode
- GPT-6 Astra
- Supported
- Muse Spark 1.3
- Supported
Reasoning
- GPT-6 Astra
- Supported
- Muse Spark 1.3
- Supported
Built-in web search
- GPT-6 Astra
- Not listed
- Muse Spark 1.3
- Not listed
Log probabilities
- GPT-6 Astra
- Not listed
- Muse Spark 1.3
- Not listed
Deterministic seed
- GPT-6 Astra
- Supported
- Muse Spark 1.3
- Not listed
Parallel tool calls
- GPT-6 Astra
- Not listed
- Muse Spark 1.3
- Not listed
Prompt caching
- GPT-6 Astra
- Supported
- Muse Spark 1.3
- Supported
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API & availability
| API & availability | GPT-6 Astra | Muse Spark 1.3 |
|---|---|---|
| API identifier | gpt-6-astra | muse-spark-1.3 |
| API providers | OpenAI, Azure, OpenAI, Amazon Bedrock, Azure, OpenAI | Not listed |
| Knowledge cutoff | Not listed | Not listed |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- GPT-6 Astra
gpt-6-astra- Muse Spark 1.3
muse-spark-1.3
API providers
- GPT-6 Astra
- OpenAI, Azure, OpenAI, Amazon Bedrock, Azure, OpenAI
- Muse Spark 1.3
- Not listed
Knowledge cutoff
- GPT-6 Astra
- Not listed
- Muse Spark 1.3
- Not listed
Prices checked
- GPT-6 Astra
- Oct 8, 2026
- Muse Spark 1.3
- Oct 8, 2026
About the models
GPT-6 Astra
OpenAI's flagship GPT-6 model for the hardest reasoning, coding and agentic work. Long-context requests (above 272K input tokens) bill at $20 input / $75 output per 1M.
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
GPT-6 Astra: $10 input and $50 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.