Apertus 8B vs GLM-4.5-Flash
GLM-4.5-Flash comes out ahead, 65 to 56 on our weighted score, and it is the cheaper option too.
Swiss AI
Apertus 8B
56/100- ECI—
- Price$0.10 / $0.20
- Context66K
- Our pick
Z.ai (Zhipu)GLM-4.5-Flash
65/100- ECI—
- PriceFree / Free
- Context131K
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Make it a three-way comparison.
GLM-4.5-Flash is our pick
GLM-4.5-Flash is the better all-round choice, scoring 65/100 against Apertus 8B (56). It leads on price, inputs & features and context window. 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-FlashGLM-4.5-Flash Free · Apertus 8B $0.125 per 1M tokens (3:1 blend)
- Longest contextGLM-4.5-FlashGLM-4.5-Flash 131,072 · Apertus 8B 65,536 tokens
- Widest inputsSame inputsApertus 8B: Text · GLM-4.5-Flash: Text
- Self-hostingApertus 8BPublishes downloadable weights (Apache-2.0)
| Measure | Weight | Apertus 8B | GLM-4.5-Flash |
|---|---|---|---|
| Price | 50% | 93 | 100 |
| Inputs & features | 30% | 25 | 35 |
| Context window | 20% | 12 | 24 |
| Overall | 100% | 56/100 | 65/100 |
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 | Apertus 8BSwiss AI | GLM-4.5-FlashZ.ai (Zhipu) |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.10 | Free (best) |
| Output | $0.20 | Free (best) |
| Cached input | — | — |
| Blended (3:1) | $0.125 | Free (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 1 providers | Official Z.AI API |
| Limits | ||
| Context window | 65,536 tokens | 131,072 tokens (best) |
| Max output | 8,192 tokens | 98,304 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | No |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | No | Yes |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | OpenApache-2.0 | Proprietary |
| API model ID | — | glm-4.5-flash |
| API providers | 1 | 4 (best) |
| Released | Sep 2, 2025 | Jul 28, 2025 |
| Knowledge cutoff | Sep 2025 | 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.
- Apertus 8B$1.40
- GLM-4.5-FlashFree
Which should you choose?
Which is better: Apertus 8B or GLM-4.5-Flash?
GLM-4.5-Flash is the better all-round choice, scoring 65/100 against Apertus 8B (56). It leads on price, inputs & features and context window. 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, Apertus 8B or GLM-4.5-Flash?
GLM-4.5-Flash is cheaper at Free input / Free output per million tokens (official Z.AI API price). Apertus 8B costs $0.10 input / $0.20 output per million tokens (median across 1 API provider). GLM-4.5-Flash is listed as free.
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Apertus 8B has not been scored yet and GLM-4.5-Flash has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Apertus 8B and GLM-4.5-Flash 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?
GLM-4.5-Flash has the largest context window at 131,072 tokens, against 65,536 for Apertus 8B. Maximum output per response: Apertus 8B up to 8,192, GLM-4.5-Flash up to 98,304 tokens.
Which can read images, PDFs, audio or video?
Apertus 8B accepts text; GLM-4.5-Flash accepts text. They handle the same number of input types.
Are any of these open source?
Apertus 8B publishes its weights (Apache-2.0) and can be self-hosted; GLM-4.5-Flash is proprietary.
Which is newer?
Apertus 8B is the newest, released Sep 2, 2025. GLM-4.5-Flash came out Jul 28, 2025. Knowledge cutoff: Apertus 8B Sep 2025, GLM-4.5-Flash 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 Oct 4, 2026.
