Grok 4.5 vs Solar Pro 4
Grok 4.5 leads the LLM Stats Score 47.0 to 36.0. Solar Pro 4 is 5.7x cheaper per token.
xAI · Upstage · Updated for 2026
Which is better?
Grok 4.5 leads the overall LLM Stats Score 47.0 to 36.0, ranking #19 overall.
In the 3 individual benchmarks reported for both models, Grok 4.5 wins 3; this is a narrower head-to-head signal than the composite indexes.
On price, Solar Pro 4 is roughly 5.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Solar Pro 4 also accepts a larger context window (524,288 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Grok 4.5
- overall performance matters — it scores 47.0 and ranks #19 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 3 of 3 exact shared results
Choose Solar Pro 4
- cost matters — it's about 5.7x cheaper per token
- you process long inputs — it offers a 524,288 token context window
- you want the most recent training data — it shipped Aug 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
14 reported for Grok 4.5 · 9 for Solar Pro 4
Grok 4.5 outperforms in 3 benchmarks (GPQA, Tau3 Banking, Terminal-Bench 2.1), while Solar Pro 4 is better at 0 benchmarks.
Grok 4.5 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Grok 4.5 ($2.00/1M tokens) is 6.7x more expensive than Solar Pro 4 ($0.30/1M tokens).
For output processing, Grok 4.5 ($6.00/1M tokens) is 5.0x more expensive than Solar Pro 4 ($1.20/1M tokens).
In conclusion, Grok 4.5 is more expensive than Solar Pro 4.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Solar Pro 4 accepts 524,288 input tokens compared to Grok 4.5's 500,000 tokens. Only Solar Pro 4 specifies output context (131,072 tokens).
Input capabilities
Documented input modalities across available providers
Grok 4.5 supports multimodal inputs, whereas Solar Pro 4 does not.
Grok 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Grok 4.5
Solar Pro 4
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 4.5 was released on 2026-07-16, while Solar Pro 4 was released on 2026-08-06.
Solar Pro 4 is 1 month newer than Grok 4.5.
Jul 16, 2026
1 months ago
Aug 6, 2026
3 weeks ago
3w newerKnowledge Cutoff
When training data ends
Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while Solar Pro 4's cutoff date is not specified.
We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without Solar Pro 4's cutoff date.
Feb 2026
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Provider Availability
Grok 4.5 is available from xAI. Solar Pro 4 is available from Upstage.
Grok 4.5
Solar Pro 4
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok 4.5 and Solar Pro 4 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok 4.5 vs Solar Pro 4.