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Comparison · 2 models · Updated Nov 2, 2026

Grok Code Fast 1 vs Aion-RP 1.0 (8B)

Grok Code Fast 1 comes out ahead, 48 to 24 on our weighted score, and it is the cheaper option too.

  1. Our pick

    xAI

    Grok Code Fast 1

    Released Sep 2, 2025

    48/100
    • ECI—
    • Price$0.20 / $1.50
    • Context256K
    Full specs Remove Grok Code Fast 1

  2. Aion Labs

    Aion-RP 1.0 (8B)

    Released Feb 4, 2025

    24/100
    • ECI—
    • Price$0.80 / $1.60
    • Context33K
    Full specs Remove Aion-RP 1.0 (8B)

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Grok Code Fast 1 is our pick

Grok Code Fast 1 is the better all-round choice, scoring 48/100 against Aion-RP 1.0 (8B) (24). It leads on price, inputs & features and context window. 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 priceGrok Code Fast 1Grok Code Fast 1 $0.525 · Aion-RP 1.0 (8B) $1.00 per 1M tokens (3:1 blend)
  • Longest contextGrok Code Fast 1Grok Code Fast 1 256,000 · Aion-RP 1.0 (8B) 32,768 tokens
  • Widest inputsSame inputsGrok Code Fast 1: Text · Aion-RP 1.0 (8B): Text
  • Self-hostingAion-RP 1.0 (8B)Publishes downloadable weights
How the score is built
MeasureWeightGrok Code Fast 1Aion-RP 1.0 (8B)
Price50%6048
Inputs & features30%350
Context window20%360
Overall100%48/10024/100

Left out because at least one model lacks the data: capability. The remaining weights were rescaled.

02 — Side by side

Every spec in one table

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

Grok Code Fast 1 vs Aion-RP 1.0 (8B) specifications side by side
SpecificationGrok Code Fast 1xAIAion-RP 1.0 (8B)Aion Labs
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
Input$0.20 (best)$0.80
Output$1.50 (best)$1.60
Cached input——
Blended (3:1)$0.525 (best)$1.00
Long-context rateSame rateSame rate
Price sourceMedian of 5 providersMedian of 4 providers
Limits
Context window256,000 tokens (best)32,768 tokens
Max output10,000 tokens29,491 tokens (best)
Inputs and features
TextYesYes
ImagesNoNo
PDFsNoNo
AudioNoNo
VideoNoNo
ReasoningYesNo
Tool callingYesNo
Structured outputNoNo
Availability
WeightsProprietaryOpen
API model ID——
API providers7 (best)4
ReleasedSep 2, 2025Feb 4, 2025
Knowledge cutoff—Dec 31, 2023
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.

  • Grok Code Fast 1$5.00
  • Aion-RP 1.0 (8B)$11.20
04 — Questions

Which should you choose?

Which is better: Grok Code Fast 1 or Aion-RP 1.0 (8B)?

Grok Code Fast 1 is the better all-round choice, scoring 48/100 against Aion-RP 1.0 (8B) (24). It leads on price, inputs & features and context window. 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, Grok Code Fast 1 or Aion-RP 1.0 (8B)?

Grok Code Fast 1 is cheaper at $0.20 input / $1.50 output per million tokens (median across 5 API providers). Aion-RP 1.0 (8B) costs $0.80 input / $1.60 output per million tokens (median across 4 API providers). At a typical mix of three input tokens to one output token, that is $0.525 per million tokens for Grok Code Fast 1 versus $1.00 for Aion-RP 1.0 (8B) (1.9× as much).

Which scores higher on benchmarks?

There is no independent benchmark that covers both models yet. Grok Code Fast 1 has not been scored yet and Aion-RP 1.0 (8B) has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Grok Code Fast 1 and Aion-RP 1.0 (8B) yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Note that Aion-RP 1.0 (8B) does not support tool calling, which most coding agents need.

Which has the bigger context window?

Grok Code Fast 1 has the largest context window at 256,000 tokens, against 32,768 for Aion-RP 1.0 (8B). Maximum output per response: Grok Code Fast 1 up to 10,000, Aion-RP 1.0 (8B) up to 29,491 tokens.

Which can read images, PDFs, audio or video?

Grok Code Fast 1 accepts text; Aion-RP 1.0 (8B) accepts text. They handle the same number of input types.

Are any of these open source?

Aion-RP 1.0 (8B) publishes its weights and can be self-hosted; Grok Code Fast 1 is proprietary.

Which is newer?

Grok Code Fast 1 is the newest, released Sep 2, 2025. Aion-RP 1.0 (8B) came out Feb 4, 2025. Knowledge cutoff: Aion-RP 1.0 (8B) Dec 31, 2023.

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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