Last refreshed 2026-05-25. Next refresh: weekly.
Why use GLM-5.1 on OpenRouter?
OpenRouter offers GLM-5.1 with pay-as-you-go pricing at $1.05/1M input tokens. OpenRouter is a multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.
Compare GLM-5.1 across 5 providers to find the best fit for your use caseSetup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: z-ai/glm-5.1z-ai/glm-5.1Request example
z-ai/glm-5.1.Gotchas
- Use provider model ID "z-ai/glm-5.1", not the LLMReference slug "glm-5.1".
Compare GLM-5.1 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Z.ai | $0.98 | $3.08 |
| OpenRouter | $1.05 | $3.50 |
| Fireworks AI | $1.40 | $4.40 |
| Vercel AI Gateway | $1.40 | $4.40 |
| Novita AI | $1.38 | $4.40 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.05 |
| Output tokens | $3.50 |
Capabilities
About GLM-5.1
Post-training variant of GLM-5 from Z.ai (Zhipu AI) with enhanced agentic coding capabilities. Released April 7, 2026. 754B parameters (40B active) in Mixture of Experts architecture, 200K token context, 128K max output. Supports autonomous plan–execute–test–fix–optimize loops for up to 8 hours without human intervention. Trained entirely on Huawei Ascend hardware (no Nvidia). Key benchmarks: SWE-bench Pro 58.4 (world #1 at release, surpassing GPT-5.4 57.7 and Claude Opus 4.6 57.3), GPQA Diamond 86.2, AIME 2026 95.3, Terminal-Bench 2.0 63.5, MCP-Atlas 71.8, Chatbot Arena Elo 1472 (May 2026, arena.ai). Available via Z.AI API ($1.40/$4.40 per 1M input/output tokens) and open weights on Hugging Face under MIT license.
FAQ
What does GLM-5.1 cost on OpenRouter?
On OpenRouter, GLM-5.1 costs $1.05 per 1M input tokens and $3.5 per 1M output tokens.
What is the context window for GLM-5.1 on OpenRouter?
GLM-5.1 supports a 203k token context window on OpenRouter.
How does OpenRouter compare to other GLM-5.1 providers?
GLM-5.1 is available from 5 providers. The cheapest input pricing is $0.98/1M tokens from Z.ai.
What API model ID do I use for GLM-5.1 on OpenRouter?
Use the model ID z-ai/glm-5.1 when calling OpenRouter's API.
Who created GLM-5.1?
GLM-5.1 was created by Zhipu AI as part of the GLM-5 model family.
Is GLM-5.1 open source?
GLM-5.1 is not open source; the seed data lists it as proprietary.