solar-mini vs GLM-4.5-Flash
GLM-4.5-Flash comes out ahead, 65 to 52 on our weighted score, and it is the cheaper option too.
Upstage
solar-mini
52/100- ECI—
- Price$0.15 / $0.15
- Context33K
- 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 solar-mini (52). 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 · solar-mini $0.15 per 1M tokens (3:1 blend)
- Longest contextGLM-4.5-FlashGLM-4.5-Flash 131,072 · solar-mini 32,768 tokens
- Widest inputsSame inputssolar-mini: Text · GLM-4.5-Flash: Text
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | solar-mini | GLM-4.5-Flash |
|---|---|---|---|
| Price | 50% | 89 | 100 |
| Inputs & features | 30% | 25 | 35 |
| Context window | 20% | 0 | 24 |
| Overall | 100% | 52/100 | 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 | solar-miniUpstage | GLM-4.5-FlashZ.ai (Zhipu) |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.15 | Free (best) |
| Output | $0.15 | Free (best) |
| Cached input | — | — |
| Blended (3:1) | $0.15 | Free (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official Upstage API | Official Z.AI API |
| Limits | ||
| Context window | 32,768 tokens | 131,072 tokens (best) |
| Max output | 4,096 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 | Proprietary | Proprietary |
| API model ID | solar-mini | glm-4.5-flash |
| API providers | 1 | 4 (best) |
| Released | Jun 12, 2024 | Jul 28, 2025 |
| Knowledge cutoff | Sep 2024 | 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.
- solar-mini$1.80
- GLM-4.5-FlashFree
Which should you choose?
Which is better: solar-mini or GLM-4.5-Flash?
GLM-4.5-Flash is the better all-round choice, scoring 65/100 against solar-mini (52). 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, solar-mini or GLM-4.5-Flash?
GLM-4.5-Flash is cheaper at Free input / Free output per million tokens (official Z.AI API price). solar-mini costs $0.15 input / $0.15 output per million tokens (official Upstage API price). GLM-4.5-Flash is listed as free.
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. solar-mini 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 solar-mini 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 32,768 for solar-mini. Maximum output per response: solar-mini up to 4,096, GLM-4.5-Flash up to 98,304 tokens.
Which can read images, PDFs, audio or video?
solar-mini accepts text; GLM-4.5-Flash accepts text. They handle the same number of input types.
Are any of these open source?
No. solar-mini and GLM-4.5-Flash are proprietary and only available through APIs and apps.
Which is newer?
GLM-4.5-Flash is the newest, released Jul 28, 2025. solar-mini came out Jun 12, 2024. Knowledge cutoff: solar-mini Sep 2024, 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.
