GPT-5.6 Sol vs Muse Spark 1.3
API pricing, context window and capabilities for GPT-5.6 Sol and Muse Spark 1.3, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGPT-5.6 Sol wins on Terminal-Bench and on context window. Muse Spark 1.3 wins on price and on intelligence.
Price
Muse Spark 1.3
Terminal-Bench
GPT-5.6 Sol
Intelligence
Muse Spark 1.3
Context window
GPT-5.6 Sol
Key takeaways
who wins on what, from the published numbersGPT-5.6 Sol wins
- Larger context window (1.1M vs 1M)
- More serving providers (6 vs 4)
Muse Spark 1.3 wins
- Cheaper input ($2.00 vs $1.25 /1M)
- Cheaper output ($10.00 vs $4.25 /1M)
- Higher max output (128K vs 131K)
Cheaper overall
Muse Spark 1.3
$1.25 + $4.25 /1M
Larger context
GPT-5.6 Sol
1.1M
More providers
GPT-5.6 Sol
6 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| GPT-5.6 Sol | Muse Spark 1.3 | |
|---|---|---|
| Input $/1M | $2.00OpenRouter routed quote | $1.25via Azure best |
| Output $/1M | $10.00OpenRouter routed quote | $4.25via Azure best |
| Context window | 1.1M best | 1M |
| Max output | 128K | 131K best |
| Serving providers | 6 best | 4 |
| Date | Released Jul 9, 2026 | Released Sep 2, 2026 |
Benchmarks
Benchmark scores, side by side| GPT-5.6 Sol | Muse Spark 1.3 | |
|---|---|---|
| Intelligence | 47.0 | 48.1 best |
| Terminal-Bench | 90% best | 84% |
| GPQA Diamond | 94% | 94% |
| Output speed | 94 t/s | 128 t/s best |
| Latency (TTFT) | 138.40s | 41.69s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GPT-5.6 Sol
via OpenRouter
$20
Muse Spark 1.3
via Meta
$11
Capabilities
feature support, side by side| Feature | GPT-5.6 Sol | Muse Spark 1.3 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, GPT-5.6 Sol or Muse Spark 1.3?
Muse Spark 1.3 is cheaper for input ($2.00 vs $1.25 per 1M tokens) from Azure. Muse Spark 1.3 is cheaper for output ($10.00 vs $4.25 per 1M tokens) from Azure.
What is the context window difference between GPT-5.6 Sol and Muse Spark 1.3?
GPT-5.6 Sol has a 1.1M-token context window and Muse Spark 1.3 has 1M tokens, so GPT-5.6 Sol can take a larger prompt.
How do GPT-5.6 Sol and Muse Spark 1.3 compare on benchmarks?
On the tracked benchmarks, GPT-5.6 Sol leads on Terminal-Bench, and Muse Spark 1.3 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Sep 28, 2026
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