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Claude Opus 4.8 vs GLM-5.2 — Price, Context, and Capability Compared

Verdict

Claude Opus 4.8 costs 4.7× more per blended million tokens than GLM-5.2. GLM-5.2 has the larger context window (1,000,000 tokens). Default to GLM-5.2 unless you specifically need Claude Opus 4.8's edge.

Spec comparison

Claude Opus 4.8GLM-5.2
Price (input)$5.00/M$1.40/M
Price (output)$25.00/M$4.40/M
Blended price$10.00/M$2.15/M
Context window500,000 tokens1,000,000 tokens
Max output64,000 tokens64,000 tokens
Modalitiestext, visiontext
Reasoning modeYesYes
Released2026-042026-05
Speed58 t/sNot measured

Cost at scale (3:1 blended)

Tokens / monthClaude Opus 4.8GLM-5.2Delta
1,000,000$10.00$2.15$7.85 (4.7×)
10,000,000$100.00$21.50$78.50 (4.7×)
100,000,000$1000.00$215.00$785.00 (4.7×)

Choose Claude Opus 4.8 if…

  • Elite coding and multi-step reasoning
  • Strong instruction following on ambiguous prompts
  • Extended-thinking mode
  • Complex, multi-step tasks where Fable 5’s premium isn’t justified.

Choose GLM-5.2 if…

  • Open-weights coding-first flagship
  • 1M-token context window
  • Beats larger frontier models on long-horizon coding
  • Long-horizon coding on open weights at a fraction of frontier pricing.

Run this exact matchup right now

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FAQ

Is Claude Opus 4.8 cheaper than GLM-5.2?

GLM-5.2 is cheaper, at $2.15 per million blended tokens vs $10.00 for Claude Opus 4.8.

Which has the bigger context window, Claude Opus 4.8 or GLM-5.2?

GLM-5.2 has the larger context window: 1,000,000 tokens vs 500,000.

Can Claude Opus 4.8 replace GLM-5.2 for coding?

Both are viable for coding. Elite coding and multi-step reasoning (Claude Opus 4.8) vs Open-weights coding-first flagship (GLM-5.2) — pick based on which strength matters more for your workload.

Related

Claude Opus 4.8 pricingGLM-5.2 pricingvs Grok 4.3vs Gemini 3.1 Provs Claude Opus 4vs Claude Fable 5Premium model tests

Pricing verified 2026-06-07. Specs verified 2026-08-08.