Z.ai: GLM 5.1

Pricing, context window and lifecycle for z-ai/glm-5.1, tracked from what the vendor publishes.

Price per million tokens

Input	$0.966
Output	$3.04
Cache price (read)	$0.179
Max price	$3.04

Facts

Model ID	z-ai/glm-5.1
Vendor	Z.ai
Token limit (context window)	204,800 tokens
Knowledge cutoff	-
End of life	none published

Supported parameters

frequency_penalty, include_reasoning, logit_bias, logprobs, max_tokens, min_p, presence_penalty, reasoning, repetition_penalty, response_format, seed, stop, structured_outputs, temperature, tool_choice, tools, top_k, top_logprobs, top_p

Other Z.ai models

z-ai/glm-4.5 $0.600 in / $2.20 out
z-ai/glm-4.5-air $0.130 in / $0.850 out
z-ai/glm-4.5v $0.600 in / $1.80 out
z-ai/glm-4.6 $0.430 in / $1.75 out
z-ai/glm-4.6v $0.300 in / $0.900 out
z-ai/glm-4.7 $0.400 in / $1.75 out
z-ai/glm-4.7-flash $0.060 in / $0.400 out
z-ai/glm-5 $0.600 in / $1.92 out
z-ai/glm-5-turbo $1.20 in / $4.00 out
z-ai/glm-5.2 $0.966 in / $3.04 out

Change history

Every change we have observed since tracking began.

Detected	Change	Detail
2026-08-30 19:14	Pricing Change	Output $3.96 -> $3.04 (-23.3%) · Cache price (read) $0.234 -> $0.179 (-23.3%) · Input $1.26 -> $0.966 (-23.3%)
2026-08-25 19:14	Pricing Change	Output $3.04 -> $3.96 (+30.4%) · Cache price (read) $0.179 -> $0.234 (+30.4%) · Input $0.966 -> $1.26 (+30.4%)
2026-08-15 19:14	Pricing Change	Output $4.40 -> $3.04 (-31.0%) · Cache price (read) $0.260 -> $0.179 (-31.0%) · Input $1.40 -> $0.966 (-31.0%)
2026-08-13 00:37	Pricing Change	Output $2.99 -> $4.40 (+47.1%) · Cache price (read) $0.177 -> $0.260 (+47.1%) · Input $0.952 -> $1.40 (+47.1%)
2026-08-05 19:14	Pricing Change	Output $3.04 -> $2.99 (-1.4%) · Cache price (read) $0.179 -> $0.177 (-1.4%) · Input $0.966 -> $0.952 (-1.4%)

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