Z.ai · GLM Flash line · lightweight · open weights
GLM-5.3-Flash was released by Z.ai on August 26, 2026, as an open-weights lightweight model in the GLM Flash line.
GLM-5.3-Flash is a 320B-parameter open model (18B active) with vision and a 1M-token context window that Z.ai compares with GLM-5.2: it solves 63.4% of DeepSWE v1.1 coding tasks versus 46.2%, at about a tenth of the API price.
Compared with GLM-5.2 · comparison chosen by Z.ai
Solves over 6 in 10 long real-world coding tasks
DeepSWE v1.1 — long software-engineering tasks in real code repositories
63.4%
▲ GLM-5.2 scored 46.2% · +17.2 points
Scores 8 points higher than GLM-5.2 on an independent intelligence test
Artificial Analysis Intelligence Index v4.3.2 — one score averaging 10 hard tests
42
▲ GLM-5.2 scores 34 · +8 points
Costs developers about a tenth of GLM-5.2
Price per 1M tokens — what developers pay, input / output
$0.15 / $0.50
▲ GLM-5.2 costs $1.40 / $4.40
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GLM-5.3-Flash is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
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