← comparisons · head to head
Muse Spark 1.3 vs GLM-5.3
Muse Spark 1.3 scores higher than GLM-5.3 on all 3 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Muse Spark 1.3 is at 61.6 and GLM-5.3 at 48.1 (out of 100). On each maker's API, Muse Spark 1.3 costs $1.25 / $4.25 per 1M tokens (input / output) and GLM-5.3 $1.40 / $4.40.
Scores as published by each board; table composed November 10, 2026.
Get the next launch alert, free →
Leaderboard by leaderboard
| Board | Muse Spark 1.3 | GLM-5.3 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,654.3 | 1,622.2 | Muse Spark 1.3 |
| SimpleBench AVG@5 % (private set) | 81.8 | 66.2 | Muse Spark 1.3 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 158 | 156.9 | Muse Spark 1.3 |
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, Muse Spark 1.3 is at 76.2 (#10 of 47) and GLM-5.3 at 51.5 (#20). Muse Spark 1.3 scores higher on both coding boards that rate them.
| Coding board | Muse Spark 1.3 | GLM-5.3 |
|---|---|---|
| LMArena · Coding | 1,507.9 | 1,499 |
| Vals Vibe Code Bench | 85.9 | 78.1 |
Muse Spark 1.3 at a glance
- Developer
- Meta
- Status
- Live since September 2, 2026
- API price
- $1.25 input / $4.25 output per 1M tokens · Meta, muse-spark-1.3
- Context window
- 1.05M tokens
Live — Sep 2 · $1.25/$4.25 per 1M and 1M ctx, identical to 1.2 · Meta: ~20% fewer tool calls, ~25% fewer tokens vs 1.2 · open weights on the roadmap, undated · the open-weights Spark shipped Oct 15 as Muse Spark Open (its own entry).
Muse Spark 1.3 is out — same price as 1.2, and the radar called it in 61 seconds
2026-09-03 · Meta released Muse Spark 1.3 today. Its own words: "We're excited to release Muse Spark 1.3, which delivers improved performance across agentic and coding tasks." The numbers Meta gives are efficiency, not capability: ~20% fewer tool calls and ~25% fewer tokens than 1.2 on coding work, fewer interaction turns, less…
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.
Muse Spark 1.3 vs GLM-5.3: quick answers
Which is better, Muse Spark 1.3 or GLM-5.3?
It depends on what you measure. Muse Spark 1.3 scores higher than GLM-5.3 on all 3 public leaderboards that rate both. Muse Spark 1.3's widest lead is on SimpleBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Muse Spark 1.3 is at 61.6 and GLM-5.3 at 48.1 (out of 100).
Which is newer, Muse Spark 1.3 or GLM-5.3?
Muse Spark 1.3. It went live on September 2, 2026, 19 days after GLM-5.3 (August 14, 2026).
Which is cheaper, Muse Spark 1.3 or GLM-5.3?
Muse Spark 1.3 is cheaper on both input and output. On each vendor's own API, Muse Spark 1.3 is $1.25 input / $4.25 output per million tokens and GLM-5.3 is $1.40 input / $4.40 output per million tokens. Prices as published in the models.dev catalog, as of 2026-11-10.
Which has the bigger context window, Muse Spark 1.3 or GLM-5.3?
Muse Spark 1.3, at 1.05M tokens against GLM-5.3's 1M, as each vendor lists it.
How do Muse Spark 1.3 and GLM-5.3 compare for coding?
On the ArtificialWatch coding index, Muse Spark 1.3 is at 76.2 (#10 of 47) and GLM-5.3 at 51.5 (#20). Muse Spark 1.3 scores higher on both coding boards that rate them.
Who makes Muse Spark 1.3 and GLM-5.3?
Muse Spark 1.3 is from Meta; GLM-5.3 is from Zhipu AI.
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.
More comparisons
Hear when the next one drops. Free.
Free: a Chrome push and an email about 15 minutes after a new model answers on a public API. Members get a text or a phone call the moment a launch is confirmed.
- Free forever
- No card
- Unsubscribe in one click
Also: the bench index · API pricing · what a workload costs on each · the wire