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GLM-5.3
● liveLive - 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) · Anthropic research (Sep 29): builds end-to-end exploits near Claude Mythos Preview's rate (ExploitBench 50 of 410 vs 56 of 410), and its safeguards fell to simple bypasses 64-100% of the time. On the board as live since 2026-08-14 — the watchers keep tracking it: lineup changes, pricing moves and deprecations all alert.
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Timeline
Anthropic published research on September 29 testing Z.ai's GLM-5.3, an open-weights model anyone can download, on offensive cyber tasks. Its finding: GLM-5.3 can build working end-to-end exploits at close to the rate of Claude Mythos Preview, the model Anthropic released only to vetted defenders.
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.
On the bench index
Coding leaderboard
#17 of 31 on the coding index, at 46.7 · combines LMArena · Coding, LiveBench · Coding, Vals Vibe Code Bench
Open weights
#2 of 8 open-weights models on the Bench Index · zai-org/GLM-5.3 on Hugging Face · 753B parameters · license custom (glm-5.3)
Where to use GLM-5.3
71 providers list GLM-5.3 in the models.dev catalog (as of 2026-10-04), under the model ids shown below.
glm-5.3glm-5.3z-ai/glm-5.3 · z-ai/glm-5.3-primezai/glm-5.3 · zai/glm-5.3-fastglm-5.3glm-5.3zai-org/glm-5.3glm-5.3glm5.3-754bglm-5.3glm-5.3glm-5.3Also listed by Baseten, Bothub, Charm Hyper, ClinePass, Cloudflare Workers AI, CoralBricks, Cortecs, CrofAI, CrossModel, Deep Infra, DevPass (LLM Gateway), DigitalOcean, Eden AI, EmpirioLabs AI, engy, Fireworks AI, Friendli, GreenPT, Hugging Face, Inco, IteraCompute, Kenari, Kilo Gateway, LLM Gateway, Melious, Merge Gateway, Mistral, NaN, NanoGPT, Nebius Token Factory, Neuralwatt, Nvidia, Ofox, Ollama Cloud, OpenCode Go, OpenCode Zen, Opper, OrcaRouter, Privatemode AI, Requesty, SCNet Token Plan, SiliconFlow, Synthetic, Tempr Gateway, TensorX, Tinfoil, Together AI, TokenGo, TokenRouter, Umans AI, Umans AI Coding Plan, Vancine, Venice AI, Vivgrid, Volcengine Ark Coding Plan, Vultr, Z.AI Coding Plan, ZenMux, Zhipu AI Coding Plan.
Listings cover the model family, so a provider may list a sibling tier under the same name. Check the id before you build on it.
GLM-5.3: quick answers
Is GLM-5.3 out?
Yes. GLM-5.3 is live and has been since August 14, 2026.
When was GLM-5.3 released?
August 14, 2026.
Is GLM-5.3 good for coding?
On the ArtificialWatch coding index it scores 46.7, #17 of 31 ranked models. The index combines LMArena · Coding, LiveBench · Coding and Vals Vibe Code Bench, taking the median of each model's percentile across them.
Is GLM-5.3 open source?
It has open weights: the trained model is public on Hugging Face as zai-org/GLM-5.3, 753B parameters as Hugging Face counts them, license custom (glm-5.3). Among the 8 open-weights models the ArtificialWatch Bench Index ranks, it is #2.
Who makes GLM-5.3?
Zhipu AI. ArtificialWatch also tracks GLM-5.3 Flash, GLM-5.2, GLM-5.5 and GLM-6 from Zhipu AI.
Where can I use GLM-5.3?
71 providers list it in the models.dev catalog, including Z.AI, Zhipu AI, OpenRouter, Vercel AI Gateway and 302.AI. The exact model ids each one lists are on this page.
How much does GLM-5.3 cost?
Z.AI's own API lists GLM-5.3 (glm-5.3) at $1.40 per million input tokens and $4.40 per million output tokens, and $0.26 per million cached input tokens. Prices as published in the models.dev catalog, as of 2026-10-04.
What is GLM-5.3's context window?
1M tokens, with up to 131K output tokens per response, as Z.AI lists GLM-5.3 (glm-5.3).
Is GLM-5.3 open weights?
Yes. GLM-5.3 is released with open weights.
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