Model Comparison
Grok 4 Fast vs Nova ProWhich is better in 2026?
Grok 4 Fast significantly outperforms across most benchmarks. Grok 4 Fast is 5.1x cheaper per token.
Verdict: Grok 4 Fast vs Nova Pro — which is better?
Grok 4 Fast (by xAI) and Nova Pro (by Amazon) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
Grok 4 Fast outperforms in 1 benchmarks (GPQA), while Nova Pro is better at 0 benchmarks. Grok 4 Fast significantly outperforms across most benchmarks.
On price, Grok 4 Fast is roughly 5.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok 4 Fast also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Grok 4 Fast if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- cost matters — it's about 5.1x cheaper per token
- you process long inputs — it offers a 2,000,000 token context window
- you want the most recent training data — it shipped Aug 2025
Choose Nova Pro if…
- you want predictable pricing at $0.80/M input and $3.20/M output
Performance Benchmarks
Comparative analysis across standard metrics
Grok 4 Fast outperforms in 1 benchmarks (GPQA), while Nova Pro is better at 0 benchmarks.
Grok 4 Fast significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Grok 4 Fast ($0.20/1M tokens) is 4.0x cheaper than Nova Pro ($0.80/1M tokens).
For output processing, Grok 4 Fast ($0.50/1M tokens) is 6.4x cheaper than Nova Pro ($3.20/1M tokens).
In conclusion, Nova Pro is more expensive than Grok 4 Fast.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok 4 Fast accepts 2,000,000 input tokens compared to Nova Pro's 300,000 tokens. Nova Pro can generate longer responses up to 300,000 tokens, while Grok 4 Fast is limited to 30,000 tokens.
Input Capabilities
Supported data types and modalities
Both Grok 4 Fast and Nova Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok 4 Fast
Nova Pro
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Grok 4 Fast was released on 2025-08-28, while Nova Pro was released on 2024-11-20.
Grok 4 Fast is 9 months newer than Nova Pro.
Aug 28, 2025
9 months ago
9mo newerNov 20, 2024
1.5 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Grok 4 Fast is available from xAI. Nova Pro is available from Bedrock.
Grok 4 Fast
Nova Pro
Outputs Comparison
Key Takeaways
Nova Pro
View detailsAmazon
No standout differentiators in the data we have for this pair.
Detailed Comparison
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FAQ
Common questions about Grok 4 Fast vs Nova Pro.