THInkling Small Open vs 
Claude Sonnet 5.5 Paid
Inkling Small vs Claude Sonnet 5.5 compared — price per token, context window, multimodality, openness and which to choose. Can the open-source model replace the paid one? Full 2026 breakdown.
Claude Sonnet 5.5 — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$1.2 /M outputNo per-token fees if you self-host
$10 /M outputManaged API (no infra to run)
Inkling Small vs Claude Sonnet 5.5 specs
| Spec | Inkling Small | Claude Sonnet 5.5 | Winner |
|---|---|---|---|
| Maker | Thinkingmachines | Anthropic | – |
| Type | Open-weight | Proprietary | THInkling Small |
| Context window | 524K tokens | 1M tokens | |
| Input price | $0.45/M · free self-host | $2/M | THInkling Small |
| Output price | $1.2/M · free self-host | $10/M | THInkling Small |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | Yes | No (API only) | THInkling Small |
| License | Open weights | Proprietary | THInkling Small |
Price gap & when to choose each
Inkling Small is ~8.3× cheaper than Claude Sonnet 5.5 on output tokens ($1.2 vs $10 per M tokens).
- You want to self-host or run on your cloud
- You prioritize data privacy & control
- You want the lowest operating costs
- You are building open or reproducible AI
- You want frontier performance through a managed API
- You need the longer 1M context window
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Inkling Small | Claude Sonnet 5.5 |
|---|---|---|
| Open weights (downloadable) | ✓ | ✗ |
| Self-hostable | ✓ | ✗ |
| Runs fully offline | ✓ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✗ | ✓ |
Benchmarks: Inkling Small vs Claude Sonnet 5.5
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Inkling Small and Claude Sonnet 5.5 score
| Criterion | Inkling Small | Claude Sonnet 5.5 |
|---|---|---|
| Cost-efficiency | 4.5 | 3.5 |
| Context window | 4.5 | 5.0 |
| Openness | 5.0 | 1.5 |
| Self-hosting | 5.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
Inkling Small Open
Inkling Small is an open-weight multimodal mixture-of-experts model from Thinking Machines Lab, with 12B active parameters out of 276B total. It is positioned as the smaller, more efficient member of...
Claude Sonnet 5.5 Paid
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Is Inkling Small as good as Claude Sonnet 5.5?
Inkling Small is open-weight and competitive on many tasks, but Claude Sonnet 5.5 may still lead on the hardest reasoning and agentic work. The gap keeps narrowing — benchmark both on your actual use case before deciding.
Can I run Inkling Small locally?
Yes. Inkling Small has open weights, so you can self-host it on your own GPUs or run it via a low-cost API. Claude Sonnet 5.5 is API-only and cannot be self-hosted.
How much cheaper is Inkling Small?
Inkling Small costs $1.2/M output vs $10/M for Claude Sonnet 5.5 — roughly 8x cheaper via API, and free if you self-host.
Inkling Small vs Claude Sonnet 5.5 — which should I pick in 2026?
Choose Inkling Small if you want to self-host, keep your data private and skip per-token fees — it's open-weight and runs on your own hardware. Choose Claude Sonnet 5.5 if you want frontier capability through a managed API with zero infrastructure to run.
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