Claude Opus 5.5 vs GLM 5.3 FlashX

Price, context window & benchmark comparison

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Claude Opus 5.5

Anthropic
$4.00 / $20.00
Input / Output · per 1M tokens
VS
Z

GLM 5.3 FlashX

Z.ai (Zhipu)
$0.37 / $1.25
Input / Output · per 1M tokens
Compare different models
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Z
Verdict: GLM 5.3 FlashX is 13.6× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. GLM 5.3 FlashX has the larger context window (1M vs 1M).
Claude Opus 5.5GLM 5.3 FlashX
Input price / 1M$4.00$0.37
Output price / 1M$20.00$1.25
Blended price (3:1)$8.00$0.59
Cached input / 1M$0.20$0.09
Context window1M1M
Max output128K131K
Intelligence index57.6—
Coding index——
Providers111
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-222026-09-18
Retirement——

Cost calculator

FAQ

Which is cheaper, Claude Opus 5.5 or GLM 5.3 FlashX?

GLM 5.3 FlashX is 13.6× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.

Claude Opus 5.5 vs GLM 5.3 FlashX: which has a bigger context window?

Claude Opus 5.5: 1,000,000 tokens. GLM 5.3 FlashX: 1,048,576 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, GLM 5.3 FlashX ≈ $1,365.

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