Aion-2.0 vs Grok Build 0.1
Grok Build 0.1 comes out ahead, 53 to 39 on our weighted score, though Aion-2.0 is 20% cheaper per token.
Aion Labs
Aion-2.0
39/100- ECI—
- Price$0.80 / $1.60
- Context131K
- Our pick
xAIGrok Build 0.1
53/100- ECI—
- Price$1.00 / $2.00
- Context256K
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Make it a three-way comparison.
Grok Build 0.1 is our pick
Grok Build 0.1 is the better all-round choice, scoring 53/100 against Aion-2.0 (39). It leads on inputs & features and context window. Aion-2.0 wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceAion-2.0Aion-2.0 $1.00 · Grok Build 0.1 $1.25 per 1M tokens (3:1 blend)
- Longest contextGrok Build 0.1Grok Build 0.1 256,000 · Aion-2.0 131,072 tokens
- Widest inputsGrok Build 0.1Aion-2.0: Text · Grok Build 0.1: Text, Images, PDFs
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Aion-2.0 | Grok Build 0.1 |
|---|---|---|---|
| Price | 50% | 48 | 43 |
| Inputs & features | 30% | 35 | 80 |
| Context window | 20% | 25 | 36 |
| Overall | 100% | 39/100 | 53/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Aion-2.0Aion Labs | Grok Build 0.1xAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.80 (best) | $1.00 |
| Output | $1.60 (best) | $2.00 |
| Cached input | — | $0.20 |
| Blended (3:1) | $1.00 (best) | $1.25 |
| Long-context rate | Same rate | Over 200K: $2.00 / $4.00 |
| Price source | Median of 3 providers | Official xAI API |
| Limits | ||
| Context window | 131,072 tokens | 256,000 tokens (best) |
| Max output | 32,768 tokens | 256,000 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | Yes |
| PDFs | No | Yes |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Structured output | No | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | — | grok-build-0.1 |
| API providers | 3 | 20 (best) |
| Released | Dec 21, 2025 | Apr 16, 2026 |
| Knowledge cutoff | — | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Aion-2.0$11.20
- Grok Build 0.1$14.00
Which should you choose?
Which is better: Aion-2.0 or Grok Build 0.1?
Grok Build 0.1 is the better all-round choice, scoring 53/100 against Aion-2.0 (39). It leads on inputs & features and context window. Aion-2.0 wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, Aion-2.0 or Grok Build 0.1?
Aion-2.0 is cheaper at $0.80 input / $1.60 output per million tokens (median across 3 API providers). Grok Build 0.1 costs $1.00 input / $2.00 output per million tokens (official xAI API price). At a typical mix of three input tokens to one output token, that is $1.00 per million tokens for Aion-2.0 versus $1.25 for Grok Build 0.1 (1.3× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Aion-2.0 has not been scored yet and Grok Build 0.1 has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Aion-2.0 and Grok Build 0.1 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
Grok Build 0.1 has the largest context window at 256,000 tokens, against 131,072 for Aion-2.0. Maximum output per response: Aion-2.0 up to 32,768, Grok Build 0.1 up to 256,000 tokens.
Which can read images, PDFs, audio or video?
Aion-2.0 accepts text; Grok Build 0.1 accepts text, images and PDFs. Grok Build 0.1 handles the widest range of inputs.
Are any of these open source?
No. Aion-2.0 and Grok Build 0.1 are proprietary and only available through APIs and apps.
Which is newer?
Grok Build 0.1 is the newest, released Apr 16, 2026. Aion-2.0 came out Dec 21, 2025.
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.
