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GLM-5.3 vs Claude Opus 5
Claude Opus 5 scores higher than GLM-5.3 on all 6 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GLM-5.3 is at 42.4 and Claude Opus 5 at 85.9 (out of 100).
Scores as published by each board; table composed September 28, 2026.
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Leaderboard by leaderboard
| Board | GLM-5.3 | Claude Opus 5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,619.1 | 1,692.5 | Claude Opus 5 |
| LiveBench global average (0-100) | 76.1 | 80.1 | Claude Opus 5 |
| SimpleBench AVG@5 % (private set) | 66.2 | 80.6 | Claude Opus 5 |
| LLM Stats LLM Stats Score · composite (0-100), their rendered top 15 | 52.1 | 54.8 | Claude Opus 5 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 57 | 67.2 | Claude Opus 5 |
| Artificial Analysis intelligence index · measured runs only | 44.8 | 50.8 | Claude Opus 5 |
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 48.3 (#16 of 31) and Claude Opus 5 at 86.7 (#5). Claude Opus 5 scores higher on all 3 coding boards that rate both.
| Coding board | GLM-5.3 | Claude Opus 5 |
|---|---|---|
| LMArena · Coding | 1,522 | 1,533.1 |
| LiveBench · Coding | 69.9 | 73.3 |
| Vals Vibe Code Bench | 78.1 | 88.4 |
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).
GLM-5.3 tops CyberGym and trails the frontier on exploitation — and we missed it because the sweep had no eyes on models.dev
2026-08-14 · 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.
Claude Opus 5 at a glance
- Developer
- Anthropic
- Status
- Live since July 24, 2026
- API price
- $5 input / $25 output per 1M tokens · Anthropic, claude-opus-5
- Context window
- 1M tokens
Live — detected 16:51 UTC Jul 24, alert fired 61s later · superseded by Opus 5.5 on Sep 22 and moved to Anthropic's legacy list; still served at $5/$25, which is now MORE than its successor.
Claude Opus 5 is live — we detected it at 16:51 UTC and had alerts out 61 seconds later
2026-07-24 · Anthropic's Claude Opus 5 went live on the public API today. Our checkers saw the id appear at 16:51:33 UTC, confirmed it on the next 60-second sweep, and the alert blast went out at 16:52:34 — sixty-one seconds from first sighting to inbox.
GLM-5.3 vs Claude Opus 5: quick answers
Which is better, GLM-5.3 or Claude Opus 5?
It depends on what you measure. Claude Opus 5 scores higher than GLM-5.3 on all 6 public leaderboards that rate both. Claude Opus 5's widest lead is on LLM Stats. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GLM-5.3 is at 42.4 and Claude Opus 5 at 85.9 (out of 100).
Which is newer, GLM-5.3 or Claude Opus 5?
GLM-5.3. It went live on August 14, 2026, 21 days after Claude Opus 5 (July 24, 2026).
Which is cheaper, GLM-5.3 or Claude Opus 5?
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 Claude Opus 5 is $5 input / $25 output per million tokens. Prices as published in the models.dev catalog, as of 2026-09-27.
Which has the bigger context window, GLM-5.3 or Claude Opus 5?
Neither. Both take 1M tokens.
How do GLM-5.3 and Claude Opus 5 compare for coding?
On the ArtificialWatch coding index, GLM-5.3 is at 48.3 (#16 of 31) and Claude Opus 5 at 86.7 (#5). Claude Opus 5 scores higher on all 3 coding boards that rate both.
Who makes GLM-5.3 and Claude Opus 5?
GLM-5.3 is from Zhipu AI; Claude Opus 5 is from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 28, 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