Meta Muse Spark 1.3 vs Z.ai GLM 5.1
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 1.3 accepts longer prompts: 1M vs 205K tokens.
- GLM 5.1 output costs $2.82 per 1M via Baidu, against the list price of $4.40.
- Muse Spark 1.3 is the newer model (released 2026-09-02).
| Muse Spark 1.3 | GLM 5.1 | |
|---|---|---|
| Vendor | Meta | Z.ai |
| Released | 2026-09-02 | 2026-04-07 |
| Input / 1M | $1.25 | $1.40 |
| Output / 1M | $4.25 | $4.40 |
| Cached input / 1M | $0.15 | $0.26 |
| Blended / 1M (3:1) | $2.00 | $2.15 |
| Context | 1M | 205K |
| Max output | 944K | 131K |
| Accepts | text, image, file, video | text |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 1 | 13 |
| Cheapest provider, output | $4.25 | $2.82 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | — | — |
Cost calculator
Muse Spark 1.3
$139 per month$4.63 per day
GLM 5.1
$150 per month$5.00 per day
Muse Spark 1.3 saves $11.25 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