GLM-5.3
Z.AIOpen weightsMITReleased Aug 18, 2026
On the arena.ai Agents leaderboard, GLM-5.3 has a task success rate of 2.00% (Max, rank #23, 95% interval 1.15%–2.84%). GLM-5.3 ranks #28 on the LMArena Text leaderboard (style control) with an Arena score of 1478.5 (±5.3, 22,543 votes). Artificial Analysis Intelligence Index: 44.8. API price: $1.40 input / $4.40 output per 1M tokens. Context: 1.05M. Nearest rivals: MiMo-V2.6-Pro (1479.2) above and Gemini 3.5 Flash (1477.5) below.
Quick answer
- Agents leaderboard
- #23 of 48 · 2.00% success
- Text (LMArena)
- #28 · 1478.5
- 17NAS overall
- #23 of 84
- API price (in / out)
- $1.40 / $4.40 per 1M tokens
- Closest rival
- MiMo-V2.6-Pro · 1479.2
- Cheaper alternative
- MiMo-V2.6-Pro: Text 1479.2, output $0.87 (80% cheaper)
- Data updated
- Oct 16, 2026 · synced daily
Sources: arena.ai, LMArena, Artificial Analysis, OpenRouter
Key metrics
Reasoning effort comparison
Artificial Analysis measurements per reasoning effort of the same model| Effort | Intelligence | Coding | tok/s | TTFT (s) | First answer (s) |
|---|---|---|---|---|---|
| maxUsed in table | 44.8 | 74.8 | 71 | 3.0 | 31 |
| low | 34.3 | – | 76 | 2.9 | 29 |
Models ranked nearby
Sorted by Arena score| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 22 |  Claude Opus 4.8 | 1481.5 | 41.8 | $25.00 | – |
| 23 |  GPT-5.5 | 1481.4 | 38.4 | $30.00 | – |
| 24 |  MiMo-V2.6-Pro | 1479.2 | 46.3 | $0.87 | 50 |
| 25 | GLM-5.3This page | 1478.5 | 44.8 | $4.40 | 71 |
| 26 |  Gemini 3.5 Flash | 1477.5 | 32.6 | $9.00 | – |
| 27 | GPT-6 Astra | 1477.3 | 52.7 | $50.00 | 49 |
| 28 | GLM-5.2 | 1475.9 | 33.7 | $4.40 | – |
More from Z.AI
| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 28 | GLM-5.2 | 1475.9 | 33.7 | $4.40 | – |
| 34 | GLM-5.3 Flash | 1473.8 | 41.8 | $0.50 | 63 |
| 42 | GLM-5.1 | 1465.2 | 26.1 | $4.07 | – |
Pricing
- Official API list price: $1.40 input and $4.40 output per 1M tokens (USD).
- At a typical 3:1 input-to-output ratio, the blended cost is about $2.15 per 1M tokens.
- Among 79 models with an output price, it is the #40 cheapest.
- The cheapest OpenRouter route charges $0.079 input / $4.80 output. That route is over 60% below list price — usually a promotion or a single provider, so check its reliability.
Sources & methodology
On the arena.ai Agents leaderboard, GLM-5.3 has a task success rate of 2.00% (Max, rank #23, 95% interval 1.15%–2.84%).
- arena.ai Agents — agent task success rate, 95% interval, sessions and rank (via the public Hugging Face dataset, CC BY 4.0).
- LMArena — Arena score (Text leaderboard with style control, the same view arena.ai shows by default), 95% confidence interval, votes and rank.
- Artificial Analysis — Intelligence / Coding Index, output speed and latency (medians).
- OpenRouter — Route prices, context length and listing date.
Arena scores use the Bradley-Terry model (not Elo); ± is the half-width of the 95% confidence interval. Latency figures are Artificial Analysis medians; for reasoning models, time to first token and to first answer include the thinking phase. Data syncs daily at 14:20 (UTC+8).
Limits: Arena scores come from anonymous users voting on chats, so they reflect conversational preference rather than agent or coding benchmarks; with few votes the interval is wide and ranks move. Prices and speeds change as providers update them.
FAQ
How does GLM-5.3 do on the Agents leaderboard?
On the arena.ai Agents leaderboard, GLM-5.3 has a task success rate of 2.00% (Max, rank #23, 95% interval 1.15%–2.84%).
What rank is GLM-5.3 right now?
GLM-5.3 is #25 on our leaderboard of 69 scored models (Arena score 1478.5); its raw LMArena rank is #28.
What does GLM-5.3 cost via API?
Input $1.40 / output $4.40 per 1M tokens (official API list price; the OpenRouter quote when no official price is available). At a typical 3:1 input-to-output ratio, the blended cost is about $2.15 per 1M tokens.
How fast is GLM-5.3?
Artificial Analysis measures about 71 output tokens per second, 3.0 s to the first token and 31 s to the first answer token; it is a reasoning model, so latency includes thinking time.
How close is GLM-5.3 to the models ranked next to it?
It is 0.7 points behind MiMo-V2.6-Pro (1479.2) and 1.0 points ahead of Gemini 3.5 Flash (1477.5); gaps smaller than the confidence interval (±5.3) are not significant.
Is GLM-5.3 open source? Can it be self-hosted?
GLM-5.3 is an open-weights model (license: MIT); you can download the weights and self-host.
What is the context length of GLM-5.3?
1.05M (1,048,576 tokens, as listed on OpenRouter).
GLM-5.3 vs MiMo-V2.6-Pro: which is better?
On the LMArena Text leaderboard GLM-5.3 scores 1478.5 and MiMo-V2.6-Pro scores 1479.2 (a 0.7-point gap, within the confidence interval, so not significant). Agent task success: GLM-5.3 2.00%, MiMo-V2.6-Pro 3.81%. On price, GLM-5.3 costs $4.40 and MiMo-V2.6-Pro $0.87 per 1M output tokens.
Is there a cheaper model close to GLM-5.3?
Yes: MiMo-V2.6-Pro scores 1479.2 on the Text leaderboard (GLM-5.3: 1478.5) and costs $0.87 per 1M output tokens, about 80% less than GLM-5.3 ($4.40).
Where does the GLM-5.3 data come from and how often is it updated?
Agent success rates come from the arena.ai Agents leaderboard (CC BY 4.0), Text scores from LMArena, intelligence and speed from Artificial Analysis, and prices and context from official list prices and OpenRouter. 17NAS syncs daily at 06:20 UTC; this page was last updated Oct 16, 2026.