GLM-4.5-Air vs ERNIE 4.5 21B A3B vs Codestral 25.08
ERNIE 4.5 21B A3B comes out ahead, 57 to 48 and 47 on our weighted score, and it is the cheaper option too.
Z.ai (Zhipu)GLM-4.5-Air
48/100- ECI—
- Price$0.20 / $1.10
- Context131K
- Our pick
BaiduERNIE 4.5 21B A3B
57/100- ECI—
- Price$0.07 / $0.28
- Context131K
Mistral AICodestral 25.08
47/100- ECI—
- Price$0.30 / $0.90
- Context128K
ERNIE 4.5 21B A3B is our pick
ERNIE 4.5 21B A3B is the better all-round choice, scoring 57/100 against GLM-4.5-Air (48) and Codestral 25.08 (47). It leads on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceERNIE 4.5 21B A3BERNIE 4.5 21B A3B $0.122 · GLM-4.5-Air $0.425 · Codestral 25.08 $0.45 per 1M tokens (3:1 blend)
- Longest contextGLM-4.5-Air and ERNIE 4.5 21B A3BGLM-4.5-Air 131,072 · ERNIE 4.5 21B A3B 131,072 · Codestral 25.08 128,000 tokens
- Widest inputsSame inputsGLM-4.5-Air: Text · ERNIE 4.5 21B A3B: Text · Codestral 25.08: Text
- Self-hostingGLM-4.5-Air and ERNIE 4.5 21B A3BPublishes downloadable weights (Apache-2.0)
| Measure | Weight | GLM-4.5-Air | ERNIE 4.5 21B A3B | Codestral 25.08 |
|---|---|---|---|---|
| Price | 50% | 65 | 89 | 64 |
| Inputs & features | 30% | 35 | 25 | 35 |
| Context window | 20% | 25 | 25 | 24 |
| Overall | 100% | 48/100 | 57/100 | 47/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GLM-4.5-AirZ.ai (Zhipu) | ERNIE 4.5 21B A3BBaidu | Codestral 25.08Mistral AI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.20 | $0.07 (best) | $0.30 |
| Output | $1.10 | $0.28 (best) | $0.90 |
| Cached input | $0.03 | — | $0.03 |
| Blended (3:1) | $0.425 | $0.122 (best) | $0.45 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Z.AI API | Median of 1 providers | Official Mistral API |
| Limits | |||
| Context window | 131,072 tokens (best) | 131,072 tokens (best) | 128,000 tokens |
| Max output | 98,304 tokens (best) | 8,000 tokens | 8,192 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | No | No |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | Yes | No | No |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | Yes |
| Availability | |||
| Weights | Open | OpenApache-2.0 | Proprietary |
| API model ID | glm-4.5-air | — | codestral-2508 |
| API providers | 19 (best) | 1 | 11 |
| Released | Jul 28, 2025 | Jun 30, 2025 | Jul 30, 2025 |
| Knowledge cutoff | Apr 2025 | — | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GLM-4.5-Air$4.20
- ERNIE 4.5 21B A3B$1.26
- Codestral 25.08$4.80
Which should you choose?
Which is better: GLM-4.5-Air, ERNIE 4.5 21B A3B or Codestral 25.08?
ERNIE 4.5 21B A3B is the better all-round choice, scoring 57/100 against GLM-4.5-Air (48) and Codestral 25.08 (47). It leads on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, GLM-4.5-Air, ERNIE 4.5 21B A3B or Codestral 25.08?
ERNIE 4.5 21B A3B is cheaper at $0.07 input / $0.28 output per million tokens (median across 1 API provider). GLM-4.5-Air costs $0.20 input / $1.10 output per million tokens (official Z.AI API price); Codestral 25.08 costs $0.30 input / $0.90 output per million tokens (official Mistral API price). At a typical mix of three input tokens to one output token, that is $0.122 per million tokens for ERNIE 4.5 21B A3B versus $0.425 for GLM-4.5-Air (3.5× as much) and $0.45 for Codestral 25.08 (3.7× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. GLM-4.5-Air has not been scored yet, ERNIE 4.5 21B A3B has not been scored yet and Codestral 25.08 has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GLM-4.5-Air, ERNIE 4.5 21B A3B and Codestral 25.08 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
GLM-4.5-Air and ERNIE 4.5 21B A3B have the largest context windows (131,072 and 131,072 tokens), against 128,000 for Codestral 25.08. Maximum output per response: GLM-4.5-Air up to 98,304, ERNIE 4.5 21B A3B up to 8,000, Codestral 25.08 up to 8,192 tokens.
Which can read images, PDFs, audio or video?
GLM-4.5-Air accepts text; ERNIE 4.5 21B A3B accepts text; Codestral 25.08 accepts text. They handle the same number of input types.
Are any of these open source?
GLM-4.5-Air and ERNIE 4.5 21B A3B publishes its weights (Apache-2.0) and can be self-hosted; Codestral 25.08 is proprietary.
Which is newer?
Codestral 25.08 is the newest, released Jul 30, 2025. GLM-4.5-Air came out Jul 28, 2025; ERNIE 4.5 21B A3B came out Jun 30, 2025. Knowledge cutoff: GLM-4.5-Air Apr 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.
