Inkling 2 Small vs Solar Pro 4
Inkling 2 Small leads the LLM Stats Score 47.1 to 33.8. Inkling 2 Small is 1.1x cheaper per token.
Thinking Machines Lab · Upstage · Updated for 2026
Which is better?
Inkling 2 Small leads the overall LLM Stats Score 47.1 to 33.8, ranking #41 overall.
In the 4 individual benchmarks reported for both models, Inkling 2 Small wins 4; this is a narrower head-to-head signal than the composite indexes.
On price, Inkling 2 Small is roughly 1.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
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 2 Small
- overall performance matters — it scores 47.1 and ranks #41 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 4 of 4 exact shared results
- cost matters — it's about 1.1x cheaper per token
- you want the most recent training data — it shipped Nov 2026
Choose Solar Pro 4
- you process long inputs — it offers a 524,288 token context window
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
11 reported for Inkling 2 Small · 9 for Solar Pro 4
Inkling 2 Small outperforms in 4 benchmarks (BrowseComp, GPQA, SWE-Bench Verified, Tau3 Banking), while Solar Pro 4 is better at 0 benchmarks.
Inkling 2 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 2 Small ($0.30/1M tokens) costs the same as Solar Pro 4 ($0.30/1M tokens).
For output processing, Inkling 2 Small ($1.00/1M tokens) is 1.2x cheaper than Solar Pro 4 ($1.20/1M tokens).
In conclusion, Solar Pro 4 is more expensive than Inkling 2 Small.*
* 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 2 Small's 256,000 tokens. Only Solar Pro 4 specifies output context (131,072 tokens).
Input capabilities
Documented input modalities across available providers
Inkling 2 Small supports multimodal inputs, whereas Solar Pro 4 does not.
Inkling 2 Small can handle both text and other forms of data like images, making it suitable for multimodal applications.
Inkling 2 Small
Solar Pro 4
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Inkling 2 Small was released on 2026-11-05, while Solar Pro 4 was released on 2026-08-06.
Inkling 2 Small is 3 months newer than Solar Pro 4.
Nov 5, 2026
4 days ago
3mo newerAug 6, 2026
3 months ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Inkling 2 Small is available from Thinking Machines Lab. Solar Pro 4 is available from Upstage.
Inkling 2 Small
Solar Pro 4
Outputs Comparison
Judge for yourself.
Run your own prompts against Inkling 2 Small and Solar Pro 4 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Inkling 2 Small vs Solar Pro 4.