o3-pro vs Inkling
Inkling comes out ahead, 59 to 51 on our weighted score, and it is the cheaper option too.
Inkling is our pick
Inkling is the better all-round choice, scoring 59/100 against o3-pro (51). It leads on price and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityInklingCapabilities Index (ECI): Inkling 148.6 · o3-pro 147.4
- Lowest priceInklingInkling $5.14 · o3-pro $35.00 per 1M tokens (3:1 blend)
- Longest contextInklingInkling 1,048,576 · o3-pro 200,000 tokens
- Widest inputsInklingo3-pro: Text, Images · Inkling: Text, Images, Audio
- Self-hostingInklingPublishes downloadable weights (Apache-2.0)
| Measure | Weight | o3-pro | Inkling |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 75 | 76 |
| Price | 25% | 0 | 16 |
| Inputs & features | 15% | 70 | 70 |
| Context window | 10% | 32 | 61 |
| Overall | 100% | 51/100 | 59/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification |  o3-proOpenAI |  InklingThinking Machines |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 147.4 | 148.6 (best) |
| ECI rank | #60 of 148 | #57 of 148 (best) |
| GPQA DiamondGraduate-level science questions | — | 88.3% |
| FrontierMath Tiers 1–3Research-level mathematics | — | 33.3% |
| OTIS Mock AIME 2024–2025Competition mathematics | — | 88.9% |
| SimpleQA VerifiedShort factual questions | — | 40.3% |
| Price per million tokens | ||
| Input | $20.00 | $3.74 (best) |
| Output | $80.00 | $9.36 (best) |
| Cached input | — | $0.748 |
| Blended (3:1) | $35.00 | $5.14 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official OpenAI API | Official Thinking Machines API |
| Limits | ||
| Context window | 200,000 tokens | 1,048,576 tokens (best) |
| Max output | 100,000 tokens | 1,048,576 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | Yes |
| Video | No | No |
| Reasoning | Yeslow · medium · high | Yeslow · medium · high · xhigh · max |
| Tool calling | Yes | Yes |
| Structured output | Yes | No |
| Availability | ||
| Weights | Proprietary | OpenApache-2.0 |
| API model ID | o3-pro | thinkingmachines/Inkling:peft:262144 |
| API providers | 6 | 23 (best) |
| Released | Jun 10, 2025 | Jul 15, 2026 |
| Knowledge cutoff | May 2024 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- o3-pro$360.00
- Inkling$56.12
Which should you choose?
Which is better: o3-pro or Inkling?
Inkling is the better all-round choice, scoring 59/100 against o3-pro (51). It leads on price and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, o3-pro or Inkling?
Inkling is cheaper at $3.74 input / $9.36 output per million tokens (official Thinking Machines API price). o3-pro costs $20.00 input / $80.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $5.14 per million tokens for Inkling versus $35.00 for o3-pro (6.8× as much).
Which scores higher on benchmarks?
Inkling scores higher on the Capabilities Index (ECI): Inkling 148.6 (#57 of 148) and o3-pro 147.4 (#60 of 148). The confidence ranges of the top two overlap (145.7–150.6 vs 145.8–149.7), so treat the gap as small.
Which is better for coding?
There are no published SWE-bench Verified results for o3-pro and Inkling yet, so there is no like-for-like coding score. On overall capability, Inkling 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?
Inkling has the largest context window at 1,048,576 tokens, against 200,000 for o3-pro. Maximum output per response: o3-pro up to 100,000, Inkling up to 1,048,576 tokens.
Which can read images, PDFs, audio or video?
o3-pro accepts text and images; Inkling accepts text, images and audio. Inkling handles the widest range of inputs.
Are any of these open source?
Inkling publishes its weights (Apache-2.0) and can be self-hosted; o3-pro is proprietary.
Which is newer?
Inkling is the newest, released Jul 15, 2026. o3-pro came out Jun 10, 2025. Knowledge cutoff: o3-pro May 2024.
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 Oct 4, 2026.
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