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Gemini 3.8 Flash vs GLM-5.3 Flash
Of the 3 public leaderboards that rate both, Gemini 3.8 Flash scores higher on 1 and GLM-5.3 Flash on 2. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.8 Flash is at 47.1 and GLM-5.3 Flash at 52.9 (out of 100).
Scores as published by each board; table composed October 8, 2026.
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Leaderboard by leaderboard
| Board | Gemini 3.8 Flash | GLM-5.3 Flash | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,583.5 | 1,609.2 | GLM-5.3 Flash |
| LiveBench global average (0-100) | 75.8 | 71.6 | Gemini 3.8 Flash |
| Artificial Analysis intelligence index · measured runs only | 40.9 | 41.8 | 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.
For coding
On the ArtificialWatch coding index, Gemini 3.8 Flash is at 47.1 (#18 of 35) and GLM-5.3 Flash at 55.9 (#14). Gemini 3.8 Flash scores higher on 2 of the 3 coding boards that rate both and GLM-5.3 Flash on 1.
| Coding board | Gemini 3.8 Flash | GLM-5.3 Flash |
|---|---|---|
| LMArena · Coding | 1,530.2 | 1,524.9 |
| LiveBench · Coding | 63.4 | 67.9 |
| Vals Vibe Code Bench | 78.7 | 30.8 |
Gemini 3.8 Flash at a glance
- Developer
- Status
- Live since September 2, 2026
- API price
- $0.75 input / $3.75 output per 1M tokens · Google, gemini-3.8-flash
- Context window
- 1.05M tokens
Live — GA Sep 2 · $0.75/$3.75 per 1M introductory through Dec 31, identical to 3.7 · 1M in / 64K out · 'our most intelligent Flash model' · 20 days after 3.7.
Gemini 3.8 Flash is GA — same price as 3.7, twenty days later
2026-09-02 · Google released Gemini 3.8 Flash today. The Gemini API changelog for September 2 reads: "Gemini 3.8 Flash generally available (GA): Released gemini-3.8-flash, our most intelligent Flash model, engineered for long-horizon software engineering, autonomous agents, and complex enterprise workflows."
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.
Gemini 3.8 Flash vs GLM-5.3 Flash: quick answers
Which is better, Gemini 3.8 Flash or GLM-5.3 Flash?
It depends on what you measure. Of the 3 public leaderboards that rate both, Gemini 3.8 Flash scores higher on 1 and GLM-5.3 Flash on 2. Gemini 3.8 Flash's widest lead is on LiveBench; GLM-5.3 Flash's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.8 Flash is at 47.1 and GLM-5.3 Flash at 52.9 (out of 100).
Which is newer, Gemini 3.8 Flash or GLM-5.3 Flash?
Gemini 3.8 Flash. It went live on September 2, 2026, 7 days after GLM-5.3 Flash (August 26, 2026).
Which is cheaper, Gemini 3.8 Flash or GLM-5.3 Flash?
GLM-5.3 Flash is cheaper on both input and output. On each vendor's own API, Gemini 3.8 Flash is $0.75 input / $3.75 output per million tokens and GLM-5.3 Flash is $0.15 input / $0.50 output per million tokens. Prices as published in the models.dev catalog, as of 2026-10-08.
Which has the bigger context window, Gemini 3.8 Flash or GLM-5.3 Flash?
Gemini 3.8 Flash, at 1.05M tokens against GLM-5.3 Flash's 1M, as each vendor lists it.
How do Gemini 3.8 Flash and GLM-5.3 Flash compare for coding?
On the ArtificialWatch coding index, Gemini 3.8 Flash is at 47.1 (#18 of 35) and GLM-5.3 Flash at 55.9 (#14). Gemini 3.8 Flash scores higher on 2 of the 3 coding boards that rate both and GLM-5.3 Flash on 1.
Who makes Gemini 3.8 Flash and GLM-5.3 Flash?
Gemini 3.8 Flash is from Google; GLM-5.3 Flash is from Zhipu AI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed October 8, 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