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Comparison · 2 models · Updated Nov 2, 2026

Inkling Small vs GPT-6.1 Sol

GPT-6.1 Sol comes out ahead, 72 to 68 on our weighted score, though Inkling Small is 5× cheaper per token.

  1. Thinking Machines

    Inkling Small

    Released Jul 30, 2026

    68/100
    • ECI150.5
    • Price$0.58 / $1.44
    • Context1.05M
    Full specs Remove Inkling Small
  2. Our pick

    OpenAI

    GPT-6.1 Sol

    Released Sep 29, 2026New

    72/100
    • ECI167.8
    • Price$2.00 / $10.00
    • Context1.05M
    Full specs Remove GPT-6.1 Sol

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

GPT-6.1 Sol is our pick

GPT-6.1 Sol is the better all-round choice, scoring 72/100 against Inkling Small (68). It leads on capability and inputs & features. Inkling Small wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-6.1 SolCapabilities Index (ECI): GPT-6.1 Sol 167.8 · Inkling Small 150.5
  • Lowest priceInkling SmallInkling Small $0.795 · GPT-6.1 Sol $4.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGPT-6.1 Sol 1,050,000 · Inkling Small 1,048,576 tokens
  • Widest inputsSame inputsInkling Small: Text, Images, Audio · GPT-6.1 Sol: Text, Images, PDFs
  • Self-hostingInkling SmallPublishes downloadable weights (Apache-2.0)
How the score is built
MeasureWeightInkling SmallGPT-6.1 Sol
CapabilityCapabilities Index (ECI)50%7799
Price25%5220
Inputs & features15%7080
Context window10%6161
Overall100%68/10072/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Inkling Small vs GPT-6.1 Sol specifications side by side
SpecificationInkling SmallThinking MachinesGPT-6.1 SolOpenAI
Capability
Capabilities Index (ECI)150.5167.8 (best)
ECI rank#58 of 165#4 of 165 (best)
GPQA DiamondGraduate-level science questions88.5%95.4% (best)
FrontierMath Tiers 1–3Research-level mathematics46.3%93.7% (best)
OTIS Mock AIME 2024–2025Competition mathematics90.0%100% (best)
SimpleQA VerifiedShort factual questions19.1%73.9% (best)
Price per million tokens
Input$0.58 (best)$2.00
Output$1.44 (best)$10.00
Cached input$0.116$0.10 (best)
Blended (3:1)$0.795 (best)$4.00
Long-context rateSame rateOver 272K: $4.00 / $15.00
Price sourceOfficial Thinking Machines APIOfficial OpenAI API
Limits
Context window1,048,576 tokens1,050,000 tokens (best)
Max output1,048,576 tokens (best)128,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioYesNo
VideoNoNo
ReasoningYeslow · medium · high · xhigh · maxYeslow · medium · high · xhigh · max
Tool callingYesYes
Structured outputNoYes
Availability
WeightsOpenApache-2.0Proprietary
API model IDthinkingmachines/Inkling-Smallgpt-6.1-sol
API providers1233 (best)
ReleasedJul 30, 2026Sep 29, 2026
Knowledge cutoff—Apr 30, 2026
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Inkling Small$8.68
  • GPT-6.1 Sol$40.00
04 — Questions

Which should you choose?

Which is better: Inkling Small or GPT-6.1 Sol?

GPT-6.1 Sol is the better all-round choice, scoring 72/100 against Inkling Small (68). It leads on capability and inputs & features. Inkling Small wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Inkling Small or GPT-6.1 Sol?

Inkling Small is cheaper at $0.58 input / $1.44 output per million tokens (official Thinking Machines API price). GPT-6.1 Sol costs $2.00 input / $10.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.795 per million tokens for Inkling Small versus $4.00 for GPT-6.1 Sol (5× as much).

Which scores higher on benchmarks?

GPT-6.1 Sol scores higher on the Capabilities Index (ECI): GPT-6.1 Sol 167.8 (#4 of 165) and Inkling Small 150.5 (#58 of 165). Their confidence ranges do not overlap (164.3–172.5 vs 147.7–152.4), so the gap is a real one. On individual benchmarks: GPQA Diamond — GPT-6.1 Sol 95.4%, Inkling Small 88.5%; FrontierMath Tiers 1–3 — GPT-6.1 Sol 93.7%, Inkling Small 46.3%; OTIS Mock AIME 2024–2025 — GPT-6.1 Sol 100%, Inkling Small 90.0%; SimpleQA Verified — GPT-6.1 Sol 73.9%, Inkling Small 19.1%.

Which is better for coding?

There are no published SWE-bench Verified results for Inkling Small and GPT-6.1 Sol yet, so there is no like-for-like coding score. On overall capability, GPT-6.1 Sol leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Their context windows are effectively the same size: Inkling Small 1,048,576 and GPT-6.1 Sol 1,050,000 tokens. Maximum output per response: Inkling Small up to 1,048,576, GPT-6.1 Sol up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Inkling Small accepts text, images and audio; GPT-6.1 Sol accepts text, images and PDFs. They handle the same number of input types.

Are any of these open source?

Inkling Small publishes its weights (Apache-2.0) and can be self-hosted; GPT-6.1 Sol is proprietary.

Which is newer?

GPT-6.1 Sol is the newest, released Sep 29, 2026. Inkling Small came out Jul 30, 2026. Knowledge cutoff: GPT-6.1 Sol Apr 30, 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.

05 — Keep comparing

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