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AI model reference · 2026

GLM 5.1

Z.AIModel details, evidence, and API facts

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks.

Text generation
Reasoning
Provider endpoint accepts tool parameters
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Context window
204,800 tokens
Maximum output
131,072 tokens
Base provider API input
$1.40 / 1M tokens
Base provider API rate
Published evidence
1 benchmark, 2 Arena results

Overview

About GLM 5.1

A concise catalog overview. Technical limits and published evaluation evidence are listed separately below.

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks.

text
reasoning

Published evaluations

Benchmark results

Only results mapped to this exact model and backed by a named source appear here. Different evaluation protocols are not treated as interchangeable.

Source-backed benchmark results for GLM 5.1
BenchmarkScoreEvaluation detailsSource
Terminal-Bench 2.1Version 2.1 of the benchmark for completing realistic tasks in terminal environments. Harness, resource limits, and attempt count are part of the protocol.58.7%±1.2Mean task successVersion: Terminal-Bench 2.1, Harbor dataset revision 6 · Split: 89 revised tasks · Harness: Claude Code · Attempts: Five attempts per task · Reasoning effort: maxProtocol note: Every result retains its agent. Rows with different agents are not model-only comparisons.; Agent: Claude Code; Run date: 2026-05-01; Confidence interval: ±1.2Methodology Terminal-BenchBenchmark owner

Human preference

Arena results

Arena scores come from blind human preference votes. They are reported separately from task benchmarks and are not used as substitutes for missing benchmark results.

Arena results for GLM 5.1
CategoryScoreRankVotesStatus
Arena TextBlind human preference score for text responses.1,468±4#3636,716Published
Arena WebDevBlind human preference score for code and web development.1,515±8#267,853Published

Technical reference

Specifications and API facts

Technical limits and reference provider prices come from the current catalog unless a reviewed external source is listed. Missing values stay marked as unavailable.

Model
Provider
Z.AI
Release date
Not available in reviewed sources
Catalog added
Apr 7, 2026
Context window
204,800 tokens
Maximum output
131,072 tokens
Knowledge cutoff
Not available in reviewed sources
License
Not available in reviewed sources
Capabilities and API
Input types
Text
Output types
Text
Reasoning
Supported
Provider endpoint tool parameters
Accepts tool parameters
Base provider API input
$1.40 / 1M tokens
Base provider cached input
$0.26 / 1M tokens
Base provider API output
$4.40 / 1M tokens

These are reference provider API rates, not Writingmate checkout charges. Access in Writingmate follows the allowances of your Writingmate plan.

Provenance

Sources and update status

Source links are attached to the facts and evaluations they support. Catalog-only values are not presented as independently verified claims.

Evidence last updated Aug 9, 2026.

Catalog record updated Apr 7, 2026.

Catalog-added dates describe when a model entered the catalog, not necessarily its public release date.

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