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GLM-5.3 vs Kimi K3
Of the 4 public leaderboards that rate both, GLM-5.3 scores higher on 2 and Kimi K3 on 2. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GLM-5.3 is at 48.1 and Kimi K3 at 38.5 (out of 100). On each maker's API, GLM-5.3 costs $1.40 / $4.40 per 1M tokens (input / output) and Kimi K3 $3 / $15.
Scores as published by each board; table composed November 10, 2026.
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Leaderboard by leaderboard
| Board | GLM-5.3 | Kimi K3 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,622.2 | 1,657.1 | Kimi K3 |
| SimpleBench AVG@5 % (private set) | 66.2 | 60.7 | GLM-5.3 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 59.8 | 53 | GLM-5.3 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 156.9 | 158.5 | Kimi K3 |
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, GLM-5.3 is at 51.5 (#20 of 47) and Kimi K3 at 65.3 (#16). Kimi K3 scores higher on both coding boards that rate them.
| Coding board | GLM-5.3 | Kimi K3 |
|---|---|---|
| LMArena · Coding | 1,499 | 1,505.5 |
| Vals Vibe Code Bench | 78.1 | 85 |
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) · 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 · Epoch AI report (Oct 29): built one-click file-reading exploits for all six Firefox releases Sep 17-Oct 26 from published-but-unshipped fixes, about $1,000 each, with no refusals at any provider.
Epoch AI: open-weight GLM 5.3 built working Firefox exploits from security fixes that had not shipped yet, for about $1,000 each
2026-10-30 · An open-weight model can now turn browser security fixes that are public but not yet shipped into working exploits on its own, according to a report Epoch AI published October 29.
Anthropic: open-weights GLM-5.3 nearly matches Claude Mythos Preview at building exploits, and its safeguards are easy to strip
2026-09-29 · 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.
Kimi K3 at a glance
- Developer
- Moonshot
- Status
- Live since July 15, 2026
- API price
- $3 input / $15 output per 1M tokens · Moonshot AI, kimi-k3
- Context window
- 1.05M tokens
Live — dropped Jul 15 · 2.8T · open weights landed Jul 27 (1.56 TB, MXFP4).
Kimi K3, day one: impressive, expensive, and a little slow
2026-07-16 · Kimi K3 has been live for a day, and the picture forming is more interesting than the launch-night hype. Here's everything we're seeing so far.
GLM-5.3 vs Kimi K3: quick answers
Which is better, GLM-5.3 or Kimi K3?
It depends on what you measure. Of the 4 public leaderboards that rate both, GLM-5.3 scores higher on 2 and Kimi K3 on 2. GLM-5.3's widest lead is on Vals AI; Kimi K3'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, GLM-5.3 is at 48.1 and Kimi K3 at 38.5 (out of 100).
Which is newer, GLM-5.3 or Kimi K3?
GLM-5.3. It went live on August 14, 2026, 30 days after Kimi K3 (July 15, 2026).
Which is cheaper, GLM-5.3 or Kimi K3?
GLM-5.3 is cheaper on both input and output. On each vendor's own API, GLM-5.3 is $1.40 input / $4.40 output per million tokens and Kimi K3 is $3 input / $15 output per million tokens. Prices as published in the models.dev catalog, as of 2026-11-10.
Which has the bigger context window, GLM-5.3 or Kimi K3?
Kimi K3, at 1.05M tokens against GLM-5.3's 1M, as each vendor lists it.
How do GLM-5.3 and Kimi K3 compare for coding?
On the ArtificialWatch coding index, GLM-5.3 is at 51.5 (#20 of 47) and Kimi K3 at 65.3 (#16). Kimi K3 scores higher on both coding boards that rate them.
Who makes GLM-5.3 and Kimi K3?
GLM-5.3 is from Zhipu AI; Kimi K3 is from Moonshot.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 10, 2026). Boards measure different things, so raw scores are only comparable within a row.
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