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.
GLM 5.2 vs 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 |
Cheapest provider for each
- GLM 5.2: CLF AI Gateway at $0.56 input and $1.76 output per 1M tokens (
clf_ai_gateway/glm-5.2) - Muse Spark Open: ai& at $1.25 input and $4.25 output per 1M tokens (
aiand/meta/muse-spark-open)
When to pick which
Pick GLM 5.2 for
- Available from 27 providers through LiteLLM, vs 5.
Pick Muse Spark Open for
- Costs 11% less per input token: $1.25 vs $1.40 per 1M.
- Returns up to 943,718 tokens per response, vs 128,000.
From differences in the data above only; where the data is equal, no reason is given.
Call GLM 5.2 or Muse Spark Open with LiteLLM
Both use the OpenAI format through LiteLLM, so switching is a model name change. Set each provider's API key in the environment first.
from litellm import completion
messages = [{"role": "user", "content": "Hello!"}]
# GLM 5.2
response = completion(model="zai/glm-5.2", messages=messages)
# Muse Spark Open
response = completion(model="aiand/meta/muse-spark-open", messages=messages)
# GLM 5.2, falling back to Muse Spark Open if the call fails
response = completion(model="zai/glm-5.2", messages=messages, fallbacks=["aiand/meta/muse-spark-open"])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.