CoBuddy vs Solar Pro 4 vs Perceptron Mk1
Solar Pro 4 comes out ahead, 53 to 46 and 45 on our weighted score, though Perceptron Mk1 is 7% cheaper per token.
BaiduCoBuddy
46/100- ECI—
- Price$0.28 / $1.13
- Context131K
- Our pick
UpstageSolar Pro 4
53/100- ECI—
- Price$0.30 / $1.20
- Context524K
Perceptron
Perceptron Mk1
45/100- ECI—
- Price$0.15 / $1.50
- Context33K
Solar Pro 4 is our pick
Solar Pro 4 is the better all-round choice, scoring 53/100 against CoBuddy (46) and Perceptron Mk1 (45). It leads on 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 pricePerceptron Mk1Perceptron Mk1 $0.487 · CoBuddy $0.492 · Solar Pro 4 $0.525 per 1M tokens (3:1 blend)
- Longest contextSolar Pro 4Solar Pro 4 524,288 · CoBuddy 131,072 · Perceptron Mk1 32,768 tokens
- Widest inputsPerceptron Mk1CoBuddy: Text · Solar Pro 4: Text · Perceptron Mk1: Text, Images, Video
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | CoBuddy | Solar Pro 4 | Perceptron Mk1 |
|---|---|---|---|---|
| Price | 50% | 62 | 60 | 62 |
| Inputs & features | 30% | 35 | 45 | 45 |
| Context window | 20% | 25 | 49 | 0 |
| Overall | 100% | 46/100 | 53/100 | 45/100 |
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 | CoBuddyBaidu | Solar Pro 4Upstage | Perceptron Mk1Perceptron |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.28 | $0.30 | $0.15 (best) |
| Output | $1.13 (best) | $1.20 | $1.50 |
| Cached input | — | $0.06 | — |
| Blended (3:1) | $0.492 | $0.525 | $0.487 (best) |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 1 providers | Official Upstage API | Median of 3 providers |
| Limits | |||
| Context window | 131,072 tokens | 524,288 tokens (best) | 32,768 tokens |
| Max output | 65,536 tokens | 131,072 tokens (best) | 8,192 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | No | Yes |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | Yes |
| Reasoning | Yes | Yesminimal · low · medium · high · xhigh · max | Yes |
| Tool calling | Yes | Yes | No |
| Structured output | No | Yes | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | — | solar-pro4 | — |
| API providers | 1 | 6 (best) | 3 |
| Released | May 6, 2026 | Aug 6, 2026 | May 12, 2026 |
| Knowledge cutoff | — | Feb 2026 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- CoBuddy$5.06
- Solar Pro 4$5.40
- Perceptron Mk1$4.50
Which should you choose?
Which is better: CoBuddy, Solar Pro 4 or Perceptron Mk1?
Solar Pro 4 is the better all-round choice, scoring 53/100 against CoBuddy (46) and Perceptron Mk1 (45). It leads on 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, CoBuddy, Solar Pro 4 or Perceptron Mk1?
Perceptron Mk1 is cheaper at $0.15 input / $1.50 output per million tokens (median across 3 API providers). CoBuddy costs $0.28 input / $1.13 output per million tokens (median across 1 API provider); Solar Pro 4 costs $0.30 input / $1.20 output per million tokens (official Upstage API price). At a typical mix of three input tokens to one output token, that is $0.487 per million tokens for Perceptron Mk1 versus $0.492 for CoBuddy (1× as much) and $0.525 for Solar Pro 4 (1.1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. CoBuddy has not been scored yet, Solar Pro 4 has not been scored yet and Perceptron Mk1 has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for CoBuddy, Solar Pro 4 and Perceptron Mk1 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Note that Perceptron Mk1 does not support tool calling, which most coding agents need.
Which has the bigger context window?
Solar Pro 4 has the largest context window at 524,288 tokens, against 131,072 for CoBuddy and 32,768 for Perceptron Mk1. Maximum output per response: CoBuddy up to 65,536, Solar Pro 4 up to 131,072, Perceptron Mk1 up to 8,192 tokens.
Which can read images, PDFs, audio or video?
CoBuddy accepts text; Solar Pro 4 accepts text; Perceptron Mk1 accepts text, images and video. Perceptron Mk1 handles the widest range of inputs.
Are any of these open source?
No. CoBuddy, Solar Pro 4 and Perceptron Mk1 are proprietary and only available through APIs and apps.
Which is newer?
Solar Pro 4 is the newest, released Aug 6, 2026. Perceptron Mk1 came out May 12, 2026; CoBuddy came out May 6, 2026. Knowledge cutoff: Solar Pro 4 Feb 2026.
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.
