Home › Compare › Anthropic: Claude Opus 5.5 vs Z.ai: GLM 5.3 Prime
Anthropic: Claude Opus 5.5 vs Z.ai: GLM 5.3 Prime: API Pricing Compared
Comparing Anthropic: Claude Opus 5.5 and Z.ai: GLM 5.3 Prime: on combined input+output list price, Z.ai: GLM 5.3 Prime is cheaper at $11.6 vs $24 per 1M tokens — a difference of $12.4 (52%). Anthropic: Claude Opus 5.5 costs $4 in / $20 out with a 1,000,000-token context; Z.ai: GLM 5.3 Prime costs $2.8 in / $8.8 out with a 1,000,000-token context.
| Anthropic: Claude Opus 5.5 | Z.ai: GLM 5.3 Prime | |
|---|---|---|
| Input /1M | $4 | $2.8 |
| Output /1M | $20 | $8.8 |
| Cached input /1M | $0.2 | $0.56 |
| Context window | 1,000,000 | 1,000,000 |
| Max output tokens | 128,000 | 131,072 |
| Cost @ 10M in + 2M out / mo | $80 | $45.6 |
Estimate your own workload in the cost calculator, or open the full pages for Anthropic: Claude Opus 5.5 and Z.ai: GLM 5.3 Prime.
Frequently asked questions
Which is cheaper, Anthropic: Claude Opus 5.5 or Z.ai: GLM 5.3 Prime?
Z.ai: GLM 5.3 Prime is cheaper on combined list price: $11.6 vs $24 per 1M tokens (input + output). At 10M input + 2M output tokens per month, Anthropic: Claude Opus 5.5 costs $80 and Z.ai: GLM 5.3 Prime costs $45.6.
Which has the larger context window, Anthropic: Claude Opus 5.5 or Z.ai: GLM 5.3 Prime?
Anthropic: Claude Opus 5.5 has a context window of 1,000,000 tokens; Z.ai: GLM 5.3 Prime has 1,000,000 tokens. The larger one is Anthropic: Claude Opus 5.5.
Price snapshot October 21, 2026, refreshed daily.