Meta Muse Spark 1.3 vs OpenAI GPT-5.4 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
- GPT-5.4 Mini is 1.2× cheaper at a typical mix of 3 input tokens per output token.
- Muse Spark 1.3 accepts longer prompts: 1M vs 400K tokens.
- Muse Spark 1.3 is the newer model (released 2026-09-02).
| Muse Spark 1.3 | GPT-5.4 Mini | |
|---|---|---|
| Vendor | Meta | OpenAI |
| Released | 2026-09-02 | 2026-03-17 |
| Input / 1M | $1.25 | $0.75 |
| Output / 1M | $4.25 | $4.50 |
| Cached input / 1M | $0.15 | $0.075 |
| Blended / 1M (3:1) | $2.00 | $1.69 |
| Context | 1M | 400K |
| Max output | 944K | 128K |
| Accepts | text, image, file, video | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 1 | 5 |
| Cheapest provider, output | $4.25 | $4.50 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | — | Operational |
Cost calculator
Muse Spark 1.3
$139 per month$4.63 per day
GPT-5.4 Mini
$113 per month$3.75 per day
GPT-5.4 Mini saves $26.25 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Muse Spark 1.3 with
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