Google: Gemini 2.5 Flash vs Grok 4 Fast
Grok 4 Fast is cheaper than Google: Gemini 2.5 Flash by about 68% on a blended (75% input / 25% output) basis. Google: Gemini 2.5 Flash charges $0.300000 / $2.500000 per 1M input/output tokens; Grok 4 Fast charges $0.200000 / $0.500000.
| Field | Google: Gemini 2.5 Flash | Grok 4 Fast |
|---|---|---|
| Input $/Mtok | $0.300000 | $0.200000 |
| Output $/Mtok | $2.500000 | $0.500000 |
| Cache read $/Mtok | $0.030000 | – |
| Cache write $/Mtok | – | – |
| Input $/Mchar | n/a | n/a |
| Output $/Mchar | n/a | n/a |
| Context window | 1048576 | 2000000 |
| Tokenizer | gemini | – |
Price history
Same workload, monthly cost
Illustrative monthly cost at 10M tokens/month, split per workload preset. Not a substitute for the calculator, which uses your own volume, cache and batch assumptions.
| Workload | Google: Gemini 2.5 Flash | Grok 4 Fast |
|---|---|---|
| Coding agent | $4.10 | $2.15 |
| RAG chat | $6.30 | $2.45 |
| Summarisation (batch) | $5.20 | $2.30 |
| Classification | $3.44 | $2.06 |
| Chat assistant | $11.80 | $3.20 |
| Content generation | $20.60 | $4.40 |
Cite this page
Google: Gemini 2.5 Flash vs Grok 4 Fast: $0.300000/$2.500000 vs $0.200000/$0.500000 per 1M tokens, as of 2026-10-04 (Token Barometer, https://tokenbarometer.com/compare/google_gemini-2.5-flash-vs-xai_grok-4-fast).
Google: Gemini 2.5 Flash page | Grok 4 Fast page | Open in calculator