Meta Muse Spark Open vs OpenAI GPT-6.1 Terra Pro
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.
- Both accept prompts up to 1M tokens.
| Muse Spark Open | GPT-6.1 Terra Pro | |
|---|---|---|
| Vendor | Meta | OpenAI |
| Released | 2026-10-15 | 2026-10-26 |
| Input / 1M | $1.25 | $1.00 |
| Output / 1M | $4.25 | $5.00 |
| Cached input / 1M | $0.15 | $0.05 |
| Blended / 1M (3:1) | $2.00 | $2.00 |
| Context | 1M | 1M |
| Max output | 944K | 128K |
| Accepts | text, image, file, audio, video | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 6 | 4 |
| Cheapest provider, output | $4.25 | $5.00 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | — | Operational |
Cost calculator
Muse Spark Open
$139 per month$4.63 per day
GPT-6.1 Terra Pro
$135 per month$4.50 per day
GPT-6.1 Terra Pro saves $3.75 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Muse Spark Open with
Compare GPT-6.1 Terra Pro with