Grok Code Fast 1 vs GLM-4.5-Air
Too close to call on our weighted score (Grok Code Fast 1 48, GLM-4.5-Air 48). The right pick depends on what you value most.
xAIGrok Code Fast 1
48/100- ECI—
- Price$0.20 / $1.50
- Context256K
Z.ai (Zhipu)GLM-4.5-Air
48/100- ECI—
- Price$0.20 / $1.10
- Context131K
Add a model
Make it a three-way comparison.
Too close to call
It is close. Our weighted score puts them within a point (Grok Code Fast 1 48/100, GLM-4.5-Air 48/100), so choose by what matters most for your work: GLM-4.5-Air on price and Grok Code Fast 1 for long inputs. 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 priceGLM-4.5-AirGLM-4.5-Air $0.425 · Grok Code Fast 1 $0.525 per 1M tokens (3:1 blend)
- Longest contextGrok Code Fast 1Grok Code Fast 1 256,000 · GLM-4.5-Air 131,072 tokens
- Widest inputsSame inputsGrok Code Fast 1: Text · GLM-4.5-Air: Text
- Self-hostingGLM-4.5-AirPublishes downloadable weights
| Measure | Weight | Grok Code Fast 1 | GLM-4.5-Air |
|---|---|---|---|
| Price | 50% | 60 | 65 |
| Inputs & features | 30% | 35 | 35 |
| Context window | 20% | 36 | 25 |
| Overall | 100% | 48/100 | 48/100 |
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 | Grok Code Fast 1xAI | GLM-4.5-AirZ.ai (Zhipu) |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.20 | $0.20 |
| Output | $1.50 | $1.10 (best) |
| Cached input | — | $0.03 |
| Blended (3:1) | $0.525 | $0.425 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 5 providers | Official Z.AI API |
| Limits | ||
| Context window | 256,000 tokens (best) | 131,072 tokens |
| Max output | 10,000 tokens | 98,304 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | No |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | — | glm-4.5-air |
| API providers | 7 | 19 (best) |
| Released | Sep 2, 2025 | Jul 28, 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.
- Grok Code Fast 1$5.00
- GLM-4.5-Air$4.20
Which should you choose?
Which is better: Grok Code Fast 1 or GLM-4.5-Air?
It is close. Our weighted score puts them within a point (Grok Code Fast 1 48/100, GLM-4.5-Air 48/100), so choose by what matters most for your work: GLM-4.5-Air on price and Grok Code Fast 1 for long inputs. 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, Grok Code Fast 1 or GLM-4.5-Air?
GLM-4.5-Air is cheaper at $0.20 input / $1.10 output per million tokens (official Z.AI API price). Grok Code Fast 1 costs $0.20 input / $1.50 output per million tokens (median across 5 API providers). At a typical mix of three input tokens to one output token, that is $0.425 per million tokens for GLM-4.5-Air versus $0.525 for Grok Code Fast 1 (1.2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Grok Code Fast 1 has not been scored yet and GLM-4.5-Air has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Grok Code Fast 1 and GLM-4.5-Air yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
Grok Code Fast 1 has the largest context window at 256,000 tokens, against 131,072 for GLM-4.5-Air. Maximum output per response: Grok Code Fast 1 up to 10,000, GLM-4.5-Air up to 98,304 tokens.
Which can read images, PDFs, audio or video?
Grok Code Fast 1 accepts text; GLM-4.5-Air accepts text. They handle the same number of input types.
Are any of these open source?
GLM-4.5-Air publishes its weights and can be self-hosted; Grok Code Fast 1 is proprietary.
Which is newer?
Grok Code Fast 1 is the newest, released Sep 2, 2025. GLM-4.5-Air came out Jul 28, 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.
Related comparisons
- Add Qwen3-VL PlusThree-way comparison
- Grok Code Fast 1 vs Qwen3-VL PlusAlibaba (Qwen)
- Grok Code Fast 1 vs Codestral 25.08Mistral AI
- Grok Code Fast 1 vs ERNIE 4.5 300B A47BBaidu
- GLM-4.5-Air vs Codestral 25.08Mistral AI
- GLM-4.5-Air vs Llama 3.3 Nemotron Super 49B v1.5NVIDIA
- GLM-4.5-Air vs Qwen3 Omni 30B A3B ThinkingAlibaba (Qwen)
