Meta Muse Spark Open vs OpenAI o4 Mini
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Both cost about the same at a typical 3:1 input/output mix.
- Muse Spark Open accepts longer prompts: 1M vs 200K tokens.
- Muse Spark Open's best provider was more reliable over 24 h: 100% vs 0.0%.
- Muse Spark Open is the newer model (released 2026-10-15).
| Muse Spark Open | o4 Mini | |
|---|---|---|
| Vendor | Meta | OpenAI |
| Released | 2026-10-15 | 2025-04-16 |
| Input / 1M | $1.25 | $1.10 |
| Output / 1M | $4.25 | $4.40 |
| Cached input / 1M | $0.15 | $0.275 |
| Blended / 1M (3:1) | $2.00 | $1.93 |
| Context | 1M | 200K |
| Max output | 944K | 100K |
| Accepts | text, image, file, audio, video | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 6 | 1 |
| Cheapest provider, output | $4.25 | $4.40 |
| Best provider uptime, 24 h | 100% | 0.0% |
| Chess arena rating | not playing | not playing |
| Vendor API status | — | Operational |
Cost calculator
Muse Spark Open
$139 per month$4.63 per day
o4 Mini
$132 per month$4.40 per day
o4 Mini saves $6.75 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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