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GLM-5.2 vs GPT-5.5
Of the 2 public leaderboards that rate both, GLM-5.2 scores higher on 1 and GPT-5.5 on 1. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GLM-5.2 is at 31.4 and GPT-5.5 at 41.7 (out of 100). On each maker's API, GLM-5.2 costs $1.40 / $4.40 per 1M tokens (input / output) and GPT-5.5 $5 / $30.
Scores as published by each board; table composed November 8, 2026.
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Leaderboard by leaderboard
| Board | GLM-5.2 | GPT-5.5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,606.4 | 1,512.6 | GLM-5.2 |
| SimpleBench AVG@5 % (private set) | 58.8 | 76.9 | GPT-5.5 |
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-5.2 is at 28.3 (#35 of 45) and GPT-5.5 at 37.8 (#29). GPT-5.5 scores higher on both coding boards that rate them.
| Coding board | GLM-5.2 | GPT-5.5 |
|---|---|---|
| LMArena · Coding | 1,487.8 | 1,494.2 |
| Vals Vibe Code Bench | 64 | 69.8 |
GLM-5.2 at a glance
- Developer
- Zhipu AI
- Status
- Live since June 16, 2026
- API price
- $1.40 input / $4.40 output per 1M tokens · Z.AI, glm-5.2
- Context window
- 1M tokens
Live — $0.40/$2.52 per 1M · no longer the current shipped GLM: 5.3 landed Aug 14 and 5.3 Flash Aug 26.
GPT-5.5 at a glance
- Developer
- OpenAI
- Status
- Live since April 24, 2026
- API price
- $5 input / $30 output per 1M tokens · OpenAI, gpt-5.5
- Context window
- 1.05M tokens
Live.
GLM-5.2 vs GPT-5.5: quick answers
Which is better, GLM-5.2 or GPT-5.5?
It depends on what you measure. Of the 2 public leaderboards that rate both, GLM-5.2 scores higher on 1 and GPT-5.5 on 1. GLM-5.2's widest lead is on LMArena; GPT-5.5'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, GLM-5.2 is at 31.4 and GPT-5.5 at 41.7 (out of 100).
Which is newer, GLM-5.2 or GPT-5.5?
GLM-5.2. It went live on June 16, 2026, 53 days after GPT-5.5 (April 24, 2026).
Which is cheaper, GLM-5.2 or GPT-5.5?
GLM-5.2 is cheaper on both input and output. On each vendor's own API, GLM-5.2 is $1.40 input / $4.40 output per million tokens and GPT-5.5 is $5 input / $30 output per million tokens. GPT-5.5's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-11-08.
Which has the bigger context window, GLM-5.2 or GPT-5.5?
GPT-5.5, at 1.05M tokens against GLM-5.2's 1M, as each vendor lists it.
How do GLM-5.2 and GPT-5.5 compare for coding?
On the ArtificialWatch coding index, GLM-5.2 is at 28.3 (#35 of 45) and GPT-5.5 at 37.8 (#29). GPT-5.5 scores higher on both coding boards that rate them.
Who makes GLM-5.2 and GPT-5.5?
GLM-5.2 is from Zhipu AI; GPT-5.5 is from OpenAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 8, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · what a workload costs on each · the wire