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GLM 5.1 vs Labs Leanstral 1 5
This page is context-first: how much text each model can take in one request. Full specs adds capabilities and limits; the pricing matrix below is only about $/million tokens from hosts that list both models.
Context window · side by side
Bar length is relative to the larger of the two windows (100% = max of this pair). This is not pricing.
Labs Leanstral 1 5 has about 1.3× the context window of the other in this pair.
Labs Leanstral 1 5 has 29% more context capacity (262K vs 202K tokens).
Quick verdicts
Short takeaways — validate with your own workloads.
Long document processing
Use Labs Leanstral 1 5. Its 262K context fits entire documents without chunking (vs 202K).
Full specs
Context, output, capabilities, and dates. Green highlights the favorable value where we compute a winner.
| Spec | GLM 5.1 | Labs Leanstral 1 5 |
|---|---|---|
| Context window | 202,752 tokens (202K) | 262,144 tokens (262K) |
| Max output tokens | 131,072 tokens (131K) | 131,072 tokens (131K) |
| Speed tier | Balanced | Balanced |
| Vision | No | No |
| Function calling | Yes | Yes |
| Extended thinking | Yes | No |
| Prompt caching | Yes | No |
| Batch API | No | No |
| Release date | Apr 2026 | N/A |
Pricing matrix
Dollar rates only: hosts that list both models, per 1M tokens. For how much text fits, use the context section above — not this table.
| Provider | GLM 5.1 in | GLM 5.1 out | Labs Leanstral 1 5 in | Labs Leanstral 1 5 out |
|---|---|---|---|---|
| Mistral | — | — | — | — |
| Openrouter | $1.05/M | $3.50/M | — | — |
| Z Ai | $1.40/M | $4.40/M | — | — |
Frequently asked questions
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