AI model comparison

Claude Opus 5.5 vs GLM 5.2

Side by side comparison of Claude Opus 5.5 and GLM 5.2 on pricing, benchmark scores, context window, and more.

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.

Input / 1M: $4
Output / 1M: $20
Context: 1M

GLM 5.2 is a large-scale reasoning model from Z.ai.

Input / 1M: $0.01
Output / 1M: $7
Context: 1.05M

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At a glance

Quick verdict

How the two models stack up on the things people ask about most.

Lower price

GLM 5.2

5.1x cheaper for a typical chat

Higher intelligence score

Not available

Not enough benchmark data

Larger context window

GLM 5.2

1.05M vs 1M tokens

Newer release

Claude Opus 5.5

Released September 22, 2026

Benchmarks

Benchmark scores

Independent scores from Artificial Analysis. Higher is better.

Intelligence index

Claude Opus 5.558.4

GLM 5.2Not available

Coding index

Claude Opus 5.5Not available

GLM 5.268.8

Agentic index

Claude Opus 5.5Not available

GLM 5.238.4

Pricing

Claude Opus 5.5 vs GLM 5.2 API pricing

Per-token API rates. Cheaper option highlighted.

Metric	Claude Opus 5.5	GLM 5.2
Input tokensPer 1M tokens	$4	$0.01
Output tokensPer 1M tokens	$20	$7
Cached input (read)Per 1M tokens	$0.20	$0.01
Cache writePer 1M tokens	$5	Not available
Web searchPer request	$0.01	Not available

What it costs in practice

Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.

Chat message

2K in, 500 out

Claude Opus 5.5$18

GLM 5.2$3.53

Coding task

30K in, 4K out

Claude Opus 5.5$200$86 cached

GLM 5.2$28.42$28.39 cached

Long document summary

150K in, 2K out

Claude Opus 5.5$640$70 cached

GLM 5.2$16.10$15.95 cached

Specs

Context window and capabilities

How much each model can read, how much it can write, and what it accepts as input.

Metric	Claude Opus 5.5	GLM 5.2
Context window	1M tokens	1.05M tokens
Max output	128K tokens	944K tokens
Input types	File, Image, Text	Text
Output types	Text	Text
Reasoning effort levels	Max, Extra high, High, Medium, Low	Extra high, High, None
Default reasoning effort	High	High
Release date	September 22, 2026	June 16, 2026

Features

Supported features

API features available for each model.

Metric	Claude Opus 5.5	GLM 5.2
Tool calling	Supported	Supported
Structured outputs	Supported	Supported
JSON mode	Supported	Supported
Reasoning	Supported	Supported
Temperature	Not supported	Supported
Stop sequences	Supported	Supported
Deterministic seed	Not supported	Supported
Verbosity control	Supported	Not supported

Our take

GLM 5.2 is 5.1x cheaper for a typical chat. GLM 5.2 has the larger context window (1.05M vs 1M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.

FAQ

Frequently asked questions

Is Claude Opus 5.5 or GLM 5.2 cheaper?

GLM 5.2 is cheaper for a typical chat (2K input tokens and 500 output tokens). GLM 5.2 costs $0.01 per 1M input tokens and $7 per 1M output tokens, while Claude Opus 5.5 costs $4 per 1M input tokens and $20 per 1M output tokens.

Which has a bigger context window, Claude Opus 5.5 or GLM 5.2?

GLM 5.2 supports up to 1.05M tokens of context, compared with 1M for Claude Opus 5.5.

Can I use Claude Opus 5.5 and GLM 5.2 at the same time?

Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Claude Opus 5.5 and GLM 5.2 answer side by side and keep the better response.

Why choose? Ask both.

Send one prompt to Claude Opus 5.5 and GLM 5.2 at the same time. Compare the answers side by side and keep the best one.

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