Z.ai · released Aug 26, 2026
GLM-5.3-Flash
GLM-5.3-Flash is Z.ai's cheap open model and reads images well for the price.
Open weights2 months oldThinks before answering
- Input price
- $0.12 / M
- Output price
- $0.42 / M
- Context
- 1M tokens
- Longest reply
- 131K
- Reads
- text, image, video, pdf
- Knows up to
- –
Where it shines
- It scores 1294 on vision, the best open-weight vision score.
- It costs about $0.12 in, $0.42 out per million tokens.
Where it struggles
- It ranks 30th on the agent leaderboard.
Where you can use it
- Hugging FaceDownloadWeights are public.
- Z.ai APIAPIAbout $0.12 in / $0.42 out per million tokens.
- OpenRouterAPIListed as
z-ai/glm-5.3-flash
How it scores on each job
Scores run 0 to 100 and blend every measure we have for that job. The number after the dot is its rank among the 33 models in the lineup.
The evidence
| Measure | Score | Rank in lineup | Source |
|---|---|---|---|
| Epoch Capabilities Index | 153 | #24 | Epoch AI |
| LMArena text | 1472 | #15 | LMArena |
| LMArena hard prompts | 1491 | #12 | LMArena |
| LMArena instruction following | 1479 | #13 | LMArena |
| LMArena multi-turn | 1471 | #13 | LMArena |
| LMArena creative writing | 1441 | #16 | LMArena |
| LMArena writing & language | 1455 | #16 | LMArena |
| LMArena coding | 1508 | #10 | LMArena |
| LMArena math | 1502 | #7 | LMArena |
| LMArena business & finance | 1461 | #15 | LMArena |
| LMArena legal & government | 1475 | #15 | LMArena |
| LMArena medicine | 1475 | #14 | LMArena |
| WebDev Arena | 1607 | #17 | LMArena |
| Vision Arena | 1294 | #10 | LMArena |
| Agent Arena | #30 | #19 | LMArena |
| GPQA Diamond | 90% | #19 | Epoch AI |
| FrontierMath | 56% | #26 | Epoch AI |
| ARC-AGI-2 | 66% | #15 | Epoch AI |
Compare it with these
NewOpen weights
DeepSeek
DeepSeek V4 Flash
DeepSeek retired V4 Flash on Sep 10, and its API name now points to V4.1 Flash.
- Price
- $0.15 in · $0.60 out
- Context
- 1M
Open weights3 months old
Z.ai
GLM-5.3
GLM-5.3 is Z.ai's open-weight model and handles chat decently at a low price.
Everyday questions
- Price
- $1.2 in · $4.18 out
- Context
- 1M
Open weights7 weeks old
DeepSeek
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash is the cheapest strong open model and builds websites well.
Websites & appsCoding
- Price
- $0.045 in · $0.50 out
- Context
- 1M