Solar Pro 2 vs GLM-4.6V-Flash
GLM-4.6V-Flash comes out ahead, 65 to 52 on our weighted score.
Upstage
Solar Pro 2
52/100- ECI—
- Price$0.25 / $0.25
- Context66K
- Our pick
Z.ai (Zhipu)GLM-4.6V-Flash
65/100- ECI—
- Price$0.161 / $0.559
- Context128K
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Make it a three-way comparison.
GLM-4.6V-Flash is our pick
GLM-4.6V-Flash is the better all-round choice, scoring 65/100 against Solar Pro 2 (52). It leads on 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 priceSolar Pro 2Solar Pro 2 $0.25 · GLM-4.6V-Flash $0.261 per 1M tokens (3:1 blend)
- Longest contextGLM-4.6V-FlashGLM-4.6V-Flash 128,000 · Solar Pro 2 65,536 tokens
- Widest inputsGLM-4.6V-FlashSolar Pro 2: Text · GLM-4.6V-Flash: Text, Images, Video
- Self-hostingGLM-4.6V-FlashPublishes downloadable weights
| Measure | Weight | Solar Pro 2 | GLM-4.6V-Flash |
|---|---|---|---|
| Price | 50% | 78 | 78 |
| Inputs & features | 30% | 35 | 70 |
| Context window | 20% | 12 | 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 Pro 2Upstage | GLM-4.6V-FlashZ.ai (Zhipu) |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.25 | $0.161 (best) |
| Output | $0.25 (best) | $0.559 |
| Cached input | — | — |
| Blended (3:1) | $0.25 (best) | $0.261 |
| Long-context rate | Same rate | Same rate |
| Price source | Official Upstage API | Median of 2 providers |
| Limits | ||
| Context window | 65,536 tokens | 128,000 tokens (best) |
| Max output | 8,192 tokens | 32,768 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | Yes |
| Reasoning | Yesminimal · high | Yes |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | solar-pro2 | glm-4.6v-flash |
| API providers | 2 | 6 (best) |
| Released | May 20, 2025 | Dec 8, 2025 |
| Knowledge cutoff | Mar 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 Pro 2$3.00
- GLM-4.6V-Flash$2.73
Which should you choose?
Which is better: Solar Pro 2 or GLM-4.6V-Flash?
GLM-4.6V-Flash is the better all-round choice, scoring 65/100 against Solar Pro 2 (52). It leads on 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 Pro 2 or GLM-4.6V-Flash?
Solar Pro 2 is cheaper at $0.25 input / $0.25 output per million tokens (official Upstage API price). GLM-4.6V-Flash costs $0.161 input / $0.559 output per million tokens (median across 2 API providers; free on Z.AI). At a typical mix of three input tokens to one output token, that is $0.25 per million tokens for Solar Pro 2 versus $0.261 for GLM-4.6V-Flash (1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Solar Pro 2 has not been scored yet and GLM-4.6V-Flash has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Solar Pro 2 and GLM-4.6V-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-4.6V-Flash has the largest context window at 128,000 tokens, against 65,536 for Solar Pro 2. Maximum output per response: Solar Pro 2 up to 8,192, GLM-4.6V-Flash up to 32,768 tokens.
Which can read images, PDFs, audio or video?
Solar Pro 2 accepts text; GLM-4.6V-Flash accepts text, images and video. GLM-4.6V-Flash handles the widest range of inputs.
Are any of these open source?
GLM-4.6V-Flash publishes its weights and can be self-hosted; Solar Pro 2 is proprietary.
Which is newer?
GLM-4.6V-Flash is the newest, released Dec 8, 2025. Solar Pro 2 came out May 20, 2025. Knowledge cutoff: Solar Pro 2 Mar 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.
