# GLM 5.2 vs Muse Spark Open

As of November 12, 2026, GLM 5.2 costs 12% more per input token than Muse Spark Open ($1.40 vs $1.25 per 1M) and has a 1,000,000-token context window versus 1,048,576.

- Page: https://models.litellm.ai/compare/glm-5.2-vs-muse-spark-open
- GLM 5.2: https://models.litellm.ai/models/glm-5.2
- Muse Spark Open: https://models.litellm.ai/models/muse-spark-open

## Side by side

| | GLM 5.2 | Muse Spark Open |
|---|---|---|
| Input, per 1M tokens | $1.40 | $1.25 |
| Output, per 1M tokens | $4.40 | $4.25 |
| Cache read, per 1M tokens | $0.26 | $0.15 |
| Cache write, per 1M tokens | $0 | – |
| Context window | 1,000,000 tokens | 1,048,576 tokens |
| Max output | 128,000 tokens | 943,718 tokens |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Structured output (JSON) | Yes | Yes |
| Prompt caching | Yes | Yes |
| Reasoning | Yes | Yes |
| Providers on LiteLLM | 27 | 5 |
| Price shown is from | Z.ai | ai& |
| Added to LiteLLM | June 2026 | October 15, 2026 |

Headline prices in USD per 1M tokens, from LiteLLM's model price file.

## Cheapest provider for each

- GLM 5.2: CLF AI Gateway at $0.56 input per 1M tokens (`clf_ai_gateway/glm-5.2`)
- Muse Spark Open: ai& at $1.25 input per 1M tokens (`aiand/meta/muse-spark-open`)

## When to pick which

- GLM 5.2: Available from 27 providers through LiteLLM, vs 5.
- Muse Spark Open: Costs 11% less per input token: $1.25 vs $1.40 per 1M.
- Muse Spark Open: Returns up to 943,718 tokens per response, vs 128,000.

## FAQ

### Which is cheaper, GLM 5.2 or Muse Spark Open?

Muse Spark Open is cheaper at 3 input tokens per output token: $2.00 per 1M tokens blended ($1.25 input, $4.25 output), versus $2.15 ($1.40 and $4.40) for GLM 5.2, as of November 12, 2026.

### Which has the larger context window, GLM 5.2 or Muse Spark Open?

Muse Spark Open has the larger context window: 1,048,576 tokens, versus 1,000,000 for GLM 5.2.

### Can I switch from GLM 5.2 to Muse Spark Open without changing my code?

Yes. Through LiteLLM both use the OpenAI format, so switching means changing the model name from "zai/glm-5.2" to "aiand/meta/muse-spark-open", or pointing a LiteLLM gateway model alias at the other model. You can also use one as a fallback for the other.