$ diff glm-5-3-flash claude-opus-5
GLM-5.3-Flash vs Claude Opus 5
Values come from GLM-5.3-Flash and Claude Opus 5, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
Z.aiGLM-5.3-Flash
- context
- 1.0M
- weights
- open
- $/M in
- $0.15
- $/M out
- $0.5
- context
- 1M
- weights
- closed
- $/M in
- $5
- $/M out
- $25
What actually differs
- Context window
- GLM-5.3-Flash takes 1.0M against 1M — modestly more room in a single request.
- Input price
- GLM-5.3-Flash at $0.15/M against $5/M — 33.3× cheaper to feed. Standard rates: one of these labs also quotes a lower cached-input tier, which applies only when a prefix is reused — see the full spec below.
- Output price
- GLM-5.3-Flash at $0.5/M against $25/M — 50.0× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Weights
- GLM-5.3-Flash publishes weights (MIT); Claude Opus 5 is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- GLM-5.3-Flash shipped 33 days after Claude Opus 5 (2026-08-26 vs 2026-07-24).
Full spec
| Attribute | GLM-5.3-Flash | Claude Opus 5 |
|---|---|---|
| Developer | Z.ai | Anthropic |
| Released | 2026-08-26 | 2026-07-24 |
| Context window | 1,048,576 (1M) | 1M tokens |
| Pricing | $0.15/M input · $0.03/M cached input · $0.50/M output | $5/M input · $25/M output (standard); $10/M · $50/M (Fast mode, research preview) |
| License | MIT | proprietary |
| Availability | Hugging Face (open weights), Z.ai API | Claude.ai, API (`claude-opus-5`), Bedrock (`anthropic.claude-opus-53`), Vertex AI, Microsoft Foundry, Claude Code, Cowork |