← comparisons · head to head
GLM-5.3 Flash vs GLM-5.2
Of the 4 public leaderboards that rate both, GLM-5.3 Flash scores higher on 2 and GLM-5.2 on 2. 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-5.2 at 23.3 (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-5.2 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,612 | 1,599.5 | GLM-5.3 Flash |
| LiveBench global average (0-100) | 71.6 | 73.2 | GLM-5.2 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 47.2 | 53.1 | GLM-5.2 |
| Artificial Analysis intelligence index · measured runs only | 41.8 | 33.7 | GLM-5.3 Flash |
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-5.2 at a glance
- Developer
- Zhipu AI
- Status
- Live since June 16, 2026
- API price
- $1.40 input / $4.40 output per 1M tokens · Z.AI, glm-5.2
- Context window
- 1M tokens
Live — $0.40/$2.52 per 1M · no longer the current shipped GLM: 5.3 landed Aug 14 and 5.3 Flash Aug 26.
GLM-5.3 Flash vs GLM-5.2: quick answers
Which is better, GLM-5.3 Flash or GLM-5.2?
It depends on what you measure. Of the 4 public leaderboards that rate both, GLM-5.3 Flash scores higher on 2 and GLM-5.2 on 2. GLM-5.3 Flash's widest lead is on Artificial Analysis; GLM-5.2's widest lead is on Vals AI. 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-5.2 at 23.3 (out of 100).
Which is newer, GLM-5.3 Flash or GLM-5.2?
GLM-5.3 Flash. It went live on August 26, 2026, 71 days after GLM-5.2 (June 16, 2026).
Which is cheaper, GLM-5.3 Flash or GLM-5.2?
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-5.2 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-5.2?
Neither. Both take 1M tokens.
Who makes GLM-5.3 Flash and GLM-5.2?
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