Grok 4 Fast vs LongCat-Flash-Thinking: Specs & Benchmark Comparison
| Characteristic | Grok 4 Fast | LongCat-Flash-Thinking |
|---|---|---|
| Company | xAI | Meituan |
| Release Date | August 27, 2025 | September 21, 2025 |
| Parameters | — | 560B |
| Multimodal | Yes | No |
| Context (input) | 2.0M | — |
| Context (output) | 30K | — |
| Input Price / 1M | $0.20 | — |
| Output Price / 1M | $0.50 | — |
| Average Score | 0.8 | 0.9 |
| Benchmarks | ||
| GPQA | 0.9 | 0.8 |
| AIME 2025 | 0.9 | 0.9 |
Visual Benchmark Comparison
Grok 4 Fast
LongCat-Flash-Thinking
GPQA0.9 vs 0.8
0.9
0.8
AIME 20250.9 vs 0.9
0.9
0.9
Verdict
LongCat-Flash-Thinking leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: Grok 4 Fast — 0.8, LongCat-Flash-Thinking — 0.9.
Recency
LongCat-Flash-Thinking is newer: released 9/21/2025 vs 8/27/2025.
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Frequently Asked Questions
Which is better for coding — Grok 4 Fast or LongCat-Flash-Thinking?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Grok 4 Fast or LongCat-Flash-Thinking?
API pricing data is available on the individual model pages.
Which has a larger context window — Grok 4 Fast or LongCat-Flash-Thinking?
Context window data is available on the individual model pages.
The Grok 4 Fast and LongCat-Flash-Thinking comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Grok 4 Fast or LongCat-Flash-Thinking page. See also the complete list of AI model comparisons.