Inkling-Small vs Solar Pro 4
Inkling-Small and Solar Pro 4 are closely matched at 38.5 and 35.2 on the LLM Stats Score. Inkling-Small and Solar Pro 4 cost the same.
Thinking Machines Lab · Upstage · Updated for 2026
Which is better?
Inkling-Small and Solar Pro 4 are closely matched on the overall LLM Stats Score at 38.5 and 35.2.
In the 6 individual benchmarks reported for both models, Inkling-Small wins 5; this is a narrower head-to-head signal than the composite indexes.
Solar Pro 4 also accepts a larger context window (524,288 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Inkling-Small
- your work emphasizes agents — it leads those capability indexes
- you value its reported benchmark strengths — it wins 5 of 6 exact shared results
- you need open weights you can self-host or fine-tune
Choose Solar Pro 4
- you process long inputs — it offers a 524,288 token context window
- you want the most recent training data — it shipped Aug 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
24 reported for Inkling-Small · 9 for Solar Pro 4
Inkling-Small outperforms in 5 benchmarks (AIME 2026, BrowseComp, GPQA, SWE-Bench Verified, Terminal-Bench 2.1), while Solar Pro 4 is better at 1 benchmark (Tau3 Banking).
Inkling-Small significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Inkling-Small ($0.30/1M tokens) costs the same as Solar Pro 4 ($0.30/1M tokens).
For output processing, Inkling-Small ($1.20/1M tokens) costs the same as Solar Pro 4 ($1.20/1M tokens).
In conclusion, Inkling-Small and Solar Pro 4 cost the same.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Solar Pro 4 accepts 524,288 input tokens compared to Inkling-Small's 256,000 tokens. Inkling-Small can generate longer responses up to 256,000 tokens, while Solar Pro 4 is limited to 131,072 tokens.
Input capabilities
Documented input modalities across available providers
Inkling-Small supports multimodal inputs, whereas Solar Pro 4 does not.
Inkling-Small can handle both text and other forms of data like images, making it suitable for multimodal applications.
Inkling-Small
Solar Pro 4
License
Usage and distribution terms
Inkling-Small is licensed under Apache 2.0, while Solar Pro 4 uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Apache 2.0
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Inkling-Small was released on 2026-07-30, while Solar Pro 4 was released on 2026-08-06.
Solar Pro 4 is 0 month newer than Inkling-Small.
Jul 30, 2026
1 months ago
Aug 6, 2026
1 months ago
1w newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Inkling-Small is available from Thinking Machines Lab, DeepInfra. Solar Pro 4 is available from Upstage.
Inkling-Small
Solar Pro 4
Outputs Comparison
Judge for yourself.
Run your own prompts against Inkling-Small and Solar Pro 4 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Inkling-Small vs Solar Pro 4.