GLM 5.3 Prime vs o3 Mini High
o3 Mini High costs 2.0x less per output token than GLM 5.3 Prime ($4.40 vs $8.80 per million). Updated October 21, 2026; no benchmark has tested both models yet.
- Coding
- No data
- Overall
- No data
- Output $/M
- $8.80
- Coding
- No data
- Overall
- 11.0
- Output $/M
- $4.40
GLM 5.3 Prime or o3 Mini High: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick GLM 5.3 Prime for a larger context window (1M against 200K tokens).
No benchmark has tested both yet. GLM 5.3 Prime has none yet; o3 Mini High on AA Coding Index, AA Intelligence Index and AA Agentic Index. Compare them on price and context instead.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Intelligence
AA Intelligence Index
No call
Only o3 Mini High has a AA Intelligence Index result, 11.0.
Directional only
Agentic work
AA Agentic Index
No call
Only o3 Mini High has a AA Agentic Index result, 0.9.
Directional only
Long documents
Listed context window
GLM 5.3 Prime
GLM 5.3 Prime takes 1M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
o3 Mini High
GLM 5.3 Prime $0.0072, o3 Mini High $0.0033 per turn.
List prices
At a glance
- Coding index
- GLM 5.3 Prime not benchmarked, o3 Mini High not benchmarked.
- Widest category
- None yet: no category has been tested on both models.
- Widest single gap
- None yet: no benchmark has tested both models.
- Output price
- GLM 5.3 Prime $8.80 against o3 Mini High $4.40 per million output tokens, 2.0x apart.
- Context window
- GLM 5.3 Prime takes 1M tokens, o3 Mini High 200K.
Benchmark by benchmark
Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.
CodingDirectional onlySix of these boards feed the Vibe Coding Index1 board measured
| Benchmark | GLM 5.3 Prime | o3 Mini High | Leader |
|---|---|---|---|
| AA Coding Index | Not measured | 16.3 | Only o3 Mini High measured |
| Neither model has a result on the other 37 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | GLM 5.3 Prime | o3 Mini High | Leader |
|---|---|---|---|
| AA Intelligence Index | Not measured | 11.0 | Only o3 Mini High measured |
| Neither model has a result on the other 1 board here | |||
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | GLM 5.3 Prime | o3 Mini High | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 0.9 | Only o3 Mini High measured |
| Neither model has a result on the other 38 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
o3 Mini High costs less
Repository review
50K input + 3K output tokens
o3 Mini High costs less
Agent loop
200K input + 10K output tokens
o3 Mini High costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Z.ai GLM 5.3 Prime | OpenAI o3 Mini High |
|---|---|---|
| Maker | Z.ai | OpenAI |
| Weights | No public weights listed | No public weights listed |
| Released | September 23, 2026 | February 12, 2025 |
| Context window | 1M | 200K |
| Input $/Mtok | $2.80 | $1.10 |
| Output $/Mtok | $8.80 | $4.40 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GLM 5.3 Prime better than o3 Mini High for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GLM 5.3 Prime for a larger context window (1M against 200K tokens).
Which is cheaper, GLM 5.3 Prime or o3 Mini High?
GLM 5.3 Prime costs $2.80 per million input tokens and $8.80 per million output tokens; o3 Mini High costs $1.10 and $4.40. Cost per solved task is known for neither of them.
Which has the bigger context window, GLM 5.3 Prime or o3 Mini High?
GLM 5.3 Prime, with 1M tokens against 200K.
Has any benchmark tested both GLM 5.3 Prime and o3 Mini High?
No benchmark has tested both yet. GLM 5.3 Prime has none yet; o3 Mini High on AA Coding Index, AA Intelligence Index and AA Agentic Index. Compare them on price and context instead. Data as of October 21, 2026.