Grok 4.5 vs Muse Spark 1.3
API pricing, context window and capabilities for Grok 4.5 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 numbersMuse Spark 1.3 wins on price, on Terminal-Bench, on intelligence and on context window.
Price
Muse Spark 1.3
Terminal-Bench
Muse Spark 1.3
Intelligence
Muse Spark 1.3
Context window
Muse Spark 1.3
Key takeaways
who wins on what, from the published numbersGrok 4.5 wins
- Higher max output (500K vs 131K)
Muse Spark 1.3 wins
- Cheaper input ($2.00 vs $1.25 /1M)
- Cheaper output ($6.00 vs $4.25 /1M)
- Larger context window (500K vs 1M)
- More serving providers (3 vs 4)
Cheaper overall
Muse Spark 1.3
$1.25 + $4.25 /1M
Larger context
Muse Spark 1.3
1M
More providers
Muse Spark 1.3
4 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.
| Grok 4.5 | Muse Spark 1.3 | |
|---|---|---|
| Input $/1M | $2.00via xAI | $1.25via Azure best |
| Output $/1M | $6.00via xAI | $4.25via Azure best |
| Context window | 500K | 1M best |
| Max output | 500K best | 131K |
| Serving providers | 3 | 4 best |
| Date | Released Jul 7, 2026 | Released Sep 2, 2026 |
Benchmarks
Benchmark scores, side by side| Grok 4.5 | Muse Spark 1.3 | |
|---|---|---|
| Intelligence | 38.8 | 48.1 best |
| Terminal-Bench | 82% | 84% best |
| GPQA Diamond | 93% | 94% best |
| Output speed | 63 t/s | 128 t/s best |
| Latency (TTFT) | 13.52s best | 41.69s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Grok 4.5
via OpenRouter
$16
Muse Spark 1.3
via Meta
$11
Capabilities
feature support, side by side| Feature | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Grok 4.5 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 ($6.00 vs $4.25 per 1M tokens) from Azure.
What is the context window difference between Grok 4.5 and Muse Spark 1.3?
Grok 4.5 has a 500K-token context window and Muse Spark 1.3 has 1M tokens, so Muse Spark 1.3 can take a larger prompt.
How do Grok 4.5 and Muse Spark 1.3 compare on benchmarks?
On the tracked benchmarks, Muse Spark 1.3 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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