text model comparison
Inkling 2 Small vs Solar Pro 4
Inkling 2 Small and Solar Pro 4 are both current text models, from Thinking Machines Lab and Upstage. Both cost $0.30 per 1M input tokens. Solar Pro 4 has the larger context window, 512,000 vs 262,144 tokens.
- Longer context window
- Solar Pro 4512K tokens against 262K tokens
- Newer release
- Inkling 2 SmallNov 2026 against Aug 2026
Data verified November 6, 2026 · Dataset 2026-11-06
Side by side
Inkling 2 Small and Solar Pro 4, line by line
Prices in effect today, compared at the same tier wherever both list one. The better value in each row is highlighted.
| Fact | Inkling 2 Small | Solar Pro 4 |
|---|---|---|
| Price | ||
| Price per 1M input tokens | $0.30 | $0.30 |
| Price per 1M output tokens | $1 (better) | $1.20 |
| Independent benchmarks | ||
| Arena Text | Not measured | 1388 Elo (#48 of 52) |
| Arena WebDev | Not measured | 1370 Elo (#44 of 46) |
| Specs | ||
| Provider | Thinking Machines Lab | Upstage |
| Release date | November 5, 2026 | August 6, 2026 |
| Access | API only | API only |
| Context window | 262,144 tokens | 512,000 tokens |
| Max output | Not reported | 128,000 tokens |
| Input | text, image | text |
| Output | text | text |
No independent benchmark has scored both models yet. Each rank counts the current models scored on that benchmark.
Scores:Arena · 2026-11-03
Charts
Against every current text model
Where Inkling 2 Small and Solar Pro 4 land among the current models of their task, on every independent benchmark, on price and on context.
Where each stands
Only Solar Pro 4 has a current Arena Text score: #48 of 52. Each bar is the share of current models it beats.
Independent benchmarks
Arena Text
Inkling 2 Small: Not scored
Solar Pro 4:#48of 52
1,388 Elo · ahead of 8%
Arena WebDev
Inkling 2 Small: Not scored
Solar Pro 4:#44of 46
1,370 Elo · ahead of 4%
Price and context
Price per 1M input tokens
Inkling 2 Small:#11of 58
$0.30 · cheaper than 75%
Solar Pro 4:#11of 58
$0.30 · cheaper than 75%
Price per 1M output tokens
Inkling 2 Small:#10of 58
$1 · cheaper than 84%
Solar Pro 4:#11of 58
$1.20 · cheaper than 77%
Context window
Inkling 2 Small:#57of 67
262K tokens · longer than 12%
Solar Pro 4:#52of 67
512K tokens · longer than 23%
Quality against price
Solar Pro 4 scores 1,388 at $0.525 (blended price per 1M tokens). The line joins the current models no other beats on both price and Arena Text score; hover any point to name it.
Quality against price: the data
| Model | Provider | Blended price per 1M tokens | Arena Text (Elo) |
|---|---|---|---|
| Gemini 4 Carbon | $4 | 1,528 | |
| Gemini 4 Argon | $4 | 1,520 | |
| Claude Opus 5.5 | Anthropic | $8 | 1,509 |
| Muse Wonder | Meta | $8 | 1,507 |
| Claude Fable 5 | Anthropic | $20 | 1,504 |
| Claude Fable 5.1 | Anthropic | $20 | 1,504 |
| Gemini 3.8 Flash | $1.50 | 1,496 | |
| Muse Spark 1.3 | Meta | $2 | 1,495 |
| Claude Opus 5 | Anthropic | $10 | 1,492 |
| Kimi K3 | Moonshot Kimi | $6 | 1,488 |
| GPT-5.6 Sol | OpenAI | $8 | 1,485 |
| Gemini 3.6 Flash | $3 | 1,483 | |
| GPT-5.5 | OpenAI | $11 | 1,482 |
| Claude Opus 4.8 | Anthropic | $10 | 1,482 |
| Qwen3.8-Max | Alibaba Qwen | $3 | 1,482 |
| GPT-6.1 Sol | OpenAI | $4 | 1,481 |
| GLM-5.3 | Z.ai | $2.15 | 1,481 |
| MiMo-V2.6-Pro | Xiaomi MiMo | $0.54 | 1,480 |
| Claude Sonnet 5.5 | Anthropic | $4 | 1,477 |
| GLM-5.3-Flash | Z.ai | $0.24 | 1,477 |
| GPT-6 Astra | OpenAI | $20 | 1,476 |
| DeepSeek-V4.1-Flash | DeepSeek | $0.52 | 1,476 |
| GPT-5.4 | OpenAI | $5.63 | 1,475 |
| Gemini 3 Flash Preview | $1.13 | 1,473 | |
| Grok 4.20 | xAI | $1.56 | 1,472 |
| GPT-5.6 Terra | OpenAI | $4.50 | 1,467 |
| Grok 4.5 | xAI | $3 | 1,465 |
| DeepSeek-V4-Pro | DeepSeek | $1.98 | 1,465 |
| Claude Sonnet 5 | Anthropic | $4 | 1,462 |
| GPT-6 Sol | OpenAI | $4 | 1,458 |
| Gemini 3.5 Flash-Lite | $0.85 | 1,456 | |
| Grok 4.6 | xAI | $3 | 1,455 |
| GPT-5.6 Luna | OpenAI | $0.45 | 1,453 |
| MiMo-V2.6-Flash | Xiaomi MiMo | $0.18 | 1,448 |
| Step 5 Preview | StepFun | $1.43 | 1,448 |
| Grok 4.3 | xAI | $1.56 | 1,442 |
| GPT-6 Luna | OpenAI | $0.20 | 1,441 |
| Grok 4.7 | xAI | $3 | 1,441 |
| Mistral Large 4 | Mistral AI | $1.05 | 1,432 |
| Claude Haiku 5.5 | Anthropic | $0.20 | 1,425 |
| GPT-4.1 | OpenAI | $3.50 | 1,415 |
| Solar Pro 4 | Upstage | $0.52 | 1,388 |
| GPT-4.1 mini | OpenAI | $0.70 | 1,383 |
| GPT-4.1 nano | OpenAI | $0.18 | 1,322 |
Cost
What each costs
Example workloads at each provider's listed rates, then every other rate either one lists. The cheaper figure in each row is highlighted.
The same work, priced
For 10M input and 2M output tokens, Solar Pro 4 costs 1.1 times as much as Inkling 2 Small, at each provider's listed rates.
10M input and 2M output tokens
Solar Pro 4 costs 1.1× as much
- Inkling 2 Small
- $5
- Solar Pro 4
- $5.40
The same, with 9M of the input tokens cached
Solar Pro 4 costs 1.3× as much
- Inkling 2 Small
- $2.57
- Solar Pro 4
- $3.24
| Workload or rate | Inkling 2 Small | Solar Pro 4 |
|---|---|---|
| Example workloads | ||
| 10M input and 2M output tokens | $5 (better) | $5.40 |
| The same, with 9M of the input tokens cached | $2.57 (better) | $3.24 |
| Other listed rates | ||
| 1M input tokens, cached | $0.03 (better) | $0.06 |
Your own bill will differ. These figures use list prices and example workloads. The AI Model Cost Audit reviews your real usage, shortlists models that score as well for each task for less, and estimates the savings.
Launch price $100, regular price $150
Verdict
When to choose each
Inkling 2 Small
Where it leads
- Lower price per 1M output tokens, $1 vs $1.20
- Accepts image input
- Cheaper cached input, $0.03 vs $0.06 per 1M tokens
Best for
- Agentic coding and office, finance and legal work at a low per-token price
- Teams that want to post-train their own variant on Tinker
Watch out for
- Closed weights for now: Thinking Machines says it will publish the full weights under Apache 2.0 the week after launch, once external safety testing ends; until then Tinker is the only way to use it
- Tinker serves it with a 64K or 256K context, although the model card lists up to 1M tokens
- In its lab's own table DeepSeek-V4.1-Flash scores higher on DeepSWE v1.1 (77.0% against 72.1%) and Claude Haiku 5.5 on Vibe Code Bench (90.4% against 81.6%); Thinking Machines also says it is less tuned for chat, and no independent benchmark score is recorded here yet
Solar Pro 4
Where it leads
- Larger context window 512,000 vs 262,144 tokens
Best for
- Korean and Japanese enterprise workloads
- Multi-step agent work with tool calls
Watch out for
- A closed model: Upstage does not disclose its parameter count
- Several of its published benchmark figures are in-house evaluations
From benchmark to production
Building on Inkling 2 Small or Solar Pro 4?
Public scores rarely hold on your own data. We test both models on your real tasks, then build the agent or pipeline around the one that wins.
AI Model Cost AuditLaunch price $100, regular price $150What the audit includes
FAQ
Inkling 2 Small vs Solar Pro 4 FAQ
Which is cheaper, Inkling 2 Small or Solar Pro 4?
Both cost $0.30 per 1M input tokens. For 10M input and 2M output tokens, Inkling 2 Small costs $5 and Solar Pro 4 $5.40 at standard rates.
Which is cheaper with prompt caching, Inkling 2 Small or Solar Pro 4?
Inkling 2 Small charges $0.03 per 1M cached input tokens, 90% below its standard input rate, and Solar Pro 4 $0.06, 80% below. With 9M of 10M input tokens cached and 2M output tokens, Inkling 2 Small costs $2.57 and Solar Pro 4 $3.24.
Which has the larger context window, Inkling 2 Small or Solar Pro 4?
Solar Pro 4 has the larger context window, 512,000 vs 262,144 tokens.
How do Inkling 2 Small and Solar Pro 4 differ in features?
Inkling 2 Small takes text and image input; Solar Pro 4 takes text.
Further reading
More on Inkling 2 Small and Solar Pro 4
Related comparisons
- Claude Haiku 5.5 vs Inkling 2 Small
- Claude Haiku 5.5 vs Solar Pro 4
- DeepSeek-V4.1-Flash vs Inkling 2 Small
- GPT-6 Luna vs Solar Pro 4
- Gemini 3.5 Flash-Lite vs Inkling 2 Small
- DeepSeek-V4.1-Flash vs Solar Pro 4
- Gemini 3.8 Flash vs Inkling 2 Small
- Muse Glimmer vs Solar Pro 4
- GLM-5.3-Flash vs Inkling 2 Small
- Gemini 3.5 Flash-Lite vs Solar Pro 4
- GLM-5.3 vs Inkling 2 Small
- Nemotron 3.5 Lightning vs Solar Pro 4
Production evaluation
Choosing between Inkling 2 Small and Solar Pro 4?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty