How much does GLM 5.1 cost?

GLM 5.1 costs $0.8988/M input tokens and $2.825/M output tokens, with separate rates for Cache Read at $0.1669/M tokens.

What is the context length of GLM 5.1?

GLM 5.1 has a 204,800 token context window. It supports up to 131,072 completion tokens.

Does GLM 5.1 support tool calling and structured outputs?

Yes. GLM 5.1 accepts tools and tool_choice for function calling on 10 of the 11 providers serving it, and requests that send tools are routed to those providers. It also supports structured outputs via a JSON schema in response_format.

Which providers serve GLM 5.1?

GLM 5.1 is served by 11 providers on OpenRouter: Baidu Qianfan, Chutes, StreamLake, SiliconFlow, AtlasCloud, Alibaba Cloud Int., NovitaAI, GMICloud and 3 more. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

When was GLM 5.1 released?

GLM 5.1 was released on April 7, 2026.

Z.ai: GLM 5.1

z-ai/glm-5.1

Model weights

Compare

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on a single task for more than 8 hours, autonomously planning, executing, and improving itself throughout the process, ultimately delivering complete, engineering-grade results.

Modalities

In / out price

36% off

$0.8988 / $2.825per 1M

Context

205K

Released

Apr 7, 2026

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick: Balanced (price + speed), Nitro (fastest), or Floor (cheapest).

Latency / throughput


	$1.40	$4.40	$0.26	0.37s	99 tok/s	100.00%
36% off	$1.40$0.8988	$4.40$2.825	$0.26$0.1669	0.87s	62 tok/s	99.81%
	$1.26	$3.96	$0.234	1.64s	82 tok/s	99.83%
	$0.90	$2.90	$0.09	1.58s	39 tok/s	99.57%
	$1.33	$4.18	$0.247	0.90s	86 tok/s	98.34%
	$1.38	$4.40	$0.26	3.69s	34 tok/s	100.00%
9% off	$1.54$1.401	$4.84$4.404	$0.286$0.2603	0.97s	77 tok/s	98.12%
	$1.40	$4.40	$0.26	1.96s	58 tok/s	100.00%
31% off	$1.40$0.966	$4.40$3.036	$0.26$0.1794	2.70s	29 tok/s	99.87%
	$1.40	$4.40	$0.26	2.11s	36 tok/s	100.00%
	$1.19	$3.74	$0.60	1.19s	65 tok/s	99.71%

Input $1.40Output $4.40
99 tok/s100.00% uptime
Input $0.8988Output $2.825
36% off
62 tok/s99.81% uptime
Input $1.26Output $3.96
82 tok/s99.83% uptime
Input $0.90Output $2.90
39 tok/s99.57% uptime
Input $1.33Output $4.18
86 tok/s98.34% uptime
Input $1.38Output $4.40
34 tok/s100.00% uptime
Input $1.401Output $4.404
9% off
77 tok/s98.12% uptime
Input $1.40Output $4.40
58 tok/s100.00% uptime
Input $0.966Output $3.036
31% off
29 tok/s99.87% uptime
Input $1.40Output $4.40
36 tok/s100.00% uptime
Input $1.19Output $3.74
65 tok/s99.71% uptime

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Weighted average

Input

$0.5223/M tokens

Output

$3.82/M tokens

GLM 5.1 — Price history

Price history

No effective price data for this selection

$0.366	$3.04	76.2%	7.9%
$0.396	$2.82	68.7%	13.6%
$0.409	$4.40	86.9%	27.8%
$0.464	$3.96	77.6%	3.6%
$0.526	$4.40	76.7%	16.7%
$0.530	$4.40	75.9%	2.6%
$0.593	$4.40	70.8%	0.9%
$0.613	$2.90	35.5%	2.1%
$0.705	$4.40	61.0%	1.7%
$0.768	$3.74	71.4%	22.6%
$0.817	$4.18	47.4%	0.5%

Effective in $0.366Effective out $3.04
Token share
7.9%
Effective in $0.396Effective out $2.82
Token share
13.6%
Effective in $0.409Effective out $4.40
Token share
27.8%
Effective in $0.464Effective out $3.96
Token share
3.6%
Effective in $0.526Effective out $4.40
Token share
16.7%
Effective in $0.530Effective out $4.40
Token share
2.6%
Effective in $0.593Effective out $4.40
Token share
0.9%
Effective in $0.613Effective out $2.90
Token share
2.1%
Effective in $0.705Effective out $4.40
Token share
1.7%
Effective in $0.768Effective out $3.74
Token share
22.6%
Effective in $0.817Effective out $4.18
Token share
0.5%

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Throughput

99tok/s

P50, best across providers

Latency

0.36s

P50, best provider

Latency / throughput

AutoExacto benchmarks

GPQA DiamondTAU-BenchVenice88.6%75.8%Alibaba Cloud Int.85.4%73.1%StreamLake85.1%73.0%GMICloud77.5%--Z.ai82.7%72.3%

+9 more providers

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

100.00%

Availability (3d)

99.66%

Availability over the last 3 days

Last 72 hours

Availability 99.66%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

99.67%

Without Routing

96.16%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for Z.ai: GLM 5.1 (Artificial Analysis, Design Arena and Vals AI)
Source	Benchmark	Score
Artificial Analysis	GLM-5.1 (Reasoning) Coding Index	55.8
Artificial Analysis	GLM-5.1 (Reasoning) Agentic Index	23.9
Artificial Analysis	GLM-5.1 (Reasoning) GPQA Diamond	86.8%
Artificial Analysis	GLM-5.1 (Reasoning) HLE	30.1%
Artificial Analysis	GLM-5.1 (Reasoning) IFBench	76.3%
Artificial Analysis	GLM-5.1 (Reasoning) τ²-Bench Telecom	97.7%
Artificial Analysis	GLM-5.1 (Reasoning) AA-LCR	73.7%
Artificial Analysis	GLM-5.1 (Reasoning) τ-Bench Banking	13.6%
Artificial Analysis	GLM-5.1 (Reasoning) GDPval-AA	31.2%
Artificial Analysis	GLM-5.1 (Reasoning) CritPt	4.6%
Artificial Analysis	GLM-5.1 (Reasoning) SciCode	44.8%
Artificial Analysis	GLM-5.1 (Reasoning) Terminal-Bench Hard	43.2%
Artificial Analysis	GLM-5.1 (Reasoning) Terminal-Bench 4.0	2.0%
Artificial Analysis	GLM-5.1 (Reasoning) Terminal-Bench 2.1	61.8%
Artificial Analysis	GLM-5.1 (Non-reasoning) GPQA Diamond	83.9%
Artificial Analysis	GLM-5.1 (Non-reasoning) HLE	27.9%
Artificial Analysis	GLM-5.1 (Non-reasoning) IFBench	52.0%
Artificial Analysis	GLM-5.1 (Non-reasoning) τ²-Bench Telecom	97.1%
Artificial Analysis	GLM-5.1 (Non-reasoning) AA-LCR	53.3%
Artificial Analysis	GLM-5.1 (Non-reasoning) CritPt	0.0%
Artificial Analysis	GLM-5.1 (Non-reasoning) Terminal-Bench Hard	35.6%
Design Arena	GLM 5.1 Models Arena 3D Elo	1231
Design Arena	GLM 5.1 Models Arena Asciiart Elo	1140
Design Arena	GLM 5.1 Models Arena Code Categories Elo	1260
Design Arena	GLM 5.1 Models Arena Data Visualization Elo	1257
Design Arena	GLM 5.1 Models Arena Game Development Elo	1255
Design Arena	GLM 5.1 Models Arena SVG Elo	1207
Design Arena	GLM 5.1 Models Arena UI Component Elo	1258
Design Arena	GLM 5.1 Models Arena Website Elo	1261
Design Arena	GLM 5.1 Agents Arena Agenticgamedev Elo	1106
Design Arena	GLM 5.1 Agents Arena Agentichtmlslides Elo	1205
Design Arena	GLM 5.1 Agents Arena Agenticslides Elo	1245
Design Arena	GLM 5.1 Agents Arena Agenticslides(Html) Elo	1204
Design Arena	GLM 5.1 Agents Arena Agenticslides(Python-Pptx) Elo	1240
Design Arena	GLM 5.1 Agents Arena Androidnative Elo	1174
Design Arena	GLM 5.1 Agents Arena Full Stack Elo	1139
Design Arena	GLM 5.1 Agents Arena Godotgamedev Elo	1036
Design Arena	GLM 5.1 Agents Arena Htmlslides Elo	1065
Design Arena	GLM 5.1 Agents Arena Mobile Apps Elo	1153
Design Arena	GLM 5.1 Agents Arena Pdf Elo	1197
Design Arena	GLM 5.1 Agents Arena Pptxslides Elo	1241
Design Arena	GLM 5.1 Agents Arena Python-Pptxslides Elo	1258
Design Arena	GLM 5.1 Agents Arena Python-Pptxslides Elo	1155
Design Arena	GLM 5.1 Agents Arena Spreadsheet Elo	1315
Design Arena	GLM 5.1 Agents Arena Webapps Elo	1153
Design Arena	GLM 5.1 Models Arena 3D Elo	1336
Design Arena	GLM 5.1 Models Arena Data Visualization Elo	1366
Design Arena	GLM 5.1 Models Arena UI Component Elo	1292
Design Arena	GLM 5.1 Models Arena Website Elo	1290
Vals AI	GLM 5.1 AIME	91.9%
Vals AI	GLM 5.1 CaseLaw v2	51.6%
Vals AI	GLM 5.1 Code Migration	25.8%
Vals AI	GLM 5.1 CorpFin v2	64.5%
Vals AI	GLM 5.1 Finance Agent (v2)	44.8%
Vals AI	GLM 5.1 GPQA Diamond	84.5%
Vals AI	GLM 5.1 Harvey's Legal Agent Benchmark v1	0.0%
Vals AI	GLM 5.1 LiveCodeBench	81.4%
Vals AI	GLM 5.1 LegalBench	84.4%
Vals AI	GLM 5.1 Legal Research Bench	27.9%
Vals AI	GLM 5.1 MedCode	41.6%
Vals AI	GLM 5.1 MedScribe	72.3%
Vals AI	GLM 5.1 MMLU Pro	86.9%
Vals AI	GLM 5.1 ProgramBench	0.0%
Vals AI	GLM 5.1 ProofBench v1	22.2%
Vals AI	GLM 5.1 Public Benefits Bench v1.1	61.8%
Vals AI	GLM 5.1 SWE-bench	76.4%
Vals AI	GLM 5.1 TaxEval v2	71.2%
Vals AI	GLM 5.1 Terminal-Bench 2.1	56.9%
Vals AI	GLM 5.1 Vals Index	52.5%
Vals AI	GLM 5.1 Vibe Code Bench v1.1	31.5%

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Janitor AI

Janitor AI is a chatbot platform where users create and chat with custom AI characters for interactive roleplay, storytelling, and immersive fiction.

6.3Btokens

Mira

Mira is a Telegram-native AI assistant.

4.79Btokens

Claude Code

Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.

3.05Btokens

Hermes Agent

Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.

2.29Btokens

SillyTavern

SillyTavern is the LLM frontend for power users, a chat interface that connects to any model and gives deep control through character creation, roleplay, and prompt customization.

1.87Btokens

Rest of OpenRouter

1.81B

Top 5 Apps

193M

Not currently available through EU in-region routing. In-region routing docs

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Z.ai: GLM 5.1

Providers