GLM 5.3 Flash is 92.3× cheaper per million tokens (blended). Claude Opus 5 leads quality index by 3.7 points (93.4 vs 89.7). GLM 5.3 Flash has the larger context window (1,048,576 vs 1,000,000 tokens). GLM 5.3 Flash is open-weights; the other is not.
Claude Opus 5 vs GLM 5.3 Flash
Live catalog fields. Best-in-row is highlighted.
Claude Opus 5
Anthropic · anthropic__claude-opus-5
GLM 5.3 Flashopen
Z.ai · z-ai__glm-5.3-flash
Identity
| Field | anthropic__claude-opus-5 | z-ai__glm-5.3-flash |
|---|---|---|
| Provider | Anthropic | Z.ai |
| Slug | anthropic__claude-opus-5 | z-ai__glm-5.3-flash |
| Status | live | live |
| Open weights | No | Yes |
| License | — | — |
| HuggingFace | — | zai-org/GLM-5.3-Flash |
Quality
| Field | anthropic__claude-opus-5 | z-ai__glm-5.3-flash |
|---|---|---|
| Quality index (0–100) | 93.4 | 89.7 |
Cost
| Field | anthropic__claude-opus-5 | z-ai__glm-5.3-flash |
|---|---|---|
| Input $ / 1M tokens | $5.00 | $0.07 |
| Cached input $ / 1M | $0.50 | $0.01 |
| Output $ / 1M tokens | $25.00 | $0.25 |
Context
| Field | anthropic__claude-opus-5 | z-ai__glm-5.3-flash |
|---|---|---|
| Max context tokens | 1,000,000 | 1,048,576 |
| Max output tokens | 128,000 | 131,072 |
Modalities
| Field | anthropic__claude-opus-5 | z-ai__glm-5.3-flash |
|---|---|---|
| Input | text, image, file | text, image, video |
| Output | text | text |