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GLM-5.3 Flash vs GLM-5.3
GLM-5.3 scores higher than GLM-5.3 Flash on all 4 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GLM-5.3 Flash is at 36 and GLM-5.3 at 42.4 (out of 100).
Scores as published by each board; table composed September 25, 2026.
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Leaderboard by leaderboard
| Board | GLM-5.3 Flash | GLM-5.3 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,612 | 1,621.8 | GLM-5.3 |
| LiveBench global average (0-100) | 71.6 | 76.1 | GLM-5.3 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 47.2 | 57 | GLM-5.3 |
| Artificial Analysis intelligence index · measured runs only | 41.8 | 44.8 | GLM-5.3 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
GLM-5.3 Flash at a glance
- Developer
- Zhipu AI
- Status
- Live since August 26, 2026
- API price
- $0.15 input / $0.50 output per 1M tokens · Z.AI, glm-5.3-flash
- Context window
- 1M tokens
Live - $0.075/$0.25 per 1M · 1.31M ctx · open weights on HF Aug 25 · shipped first as the stealth id ox-alpha, which our sweep read FREE at ~1.05M ctx across three gateways Aug 20-21 · that Z.ai confirmed the stealth run was this model on Aug 26 is search-grade, not our own reading.
GLM-5.3 at a glance
- Developer
- Zhipu AI
- Status
- Live since August 14, 2026
- API price
- $1.40 input / $4.40 output per 1M tokens · Z.AI, glm-5.3
- Context window
- 1M tokens
Live - same 743B base as 5.2, every gain from post-training · tops CyberGym · open weights on Hugging Face (zai-org/GLM-5.3, 141 safetensors files, public when we read it Sep 25; repo created Aug 25).
GLM-5.3 tops CyberGym and trails the frontier on exploitation — and we missed it because the sweep had no eyes on models.dev
2026-08-14 · Z.ai shipped GLM-5.3 today, and we did not catch it. The entry was armed and the pattern was right — the sweep simply had no source that carried the id. That is now fixed, and the fix is the more useful half of this post.
GLM-5.3 Flash vs GLM-5.3: quick answers
Which is better, GLM-5.3 Flash or GLM-5.3?
It depends on what you measure. GLM-5.3 scores higher than GLM-5.3 Flash on all 4 public leaderboards that rate both. GLM-5.3's widest lead is on LiveBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GLM-5.3 Flash is at 36 and GLM-5.3 at 42.4 (out of 100).
Which is newer, GLM-5.3 Flash or GLM-5.3?
GLM-5.3 Flash. It went live on August 26, 2026, 12 days after GLM-5.3 (August 14, 2026).
Which is cheaper, GLM-5.3 Flash or GLM-5.3?
GLM-5.3 Flash is cheaper on both input and output. On each vendor's own API, GLM-5.3 Flash is $0.15 input / $0.50 output per million tokens and GLM-5.3 is $1.40 input / $4.40 output per million tokens. Prices as published in the models.dev catalog, as of 2026-09-25.
Which has the bigger context window, GLM-5.3 Flash or GLM-5.3?
Neither. Both take 1M tokens.
Who makes GLM-5.3 Flash and GLM-5.3?
Both are from Zhipu AI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 25, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · the wire