# Gemini vs Grok: API prices compared, dated and sourced

Canonical page: https://bertrande.com/en/vs/gemini-vs-grok/
License: CC-BY-4.0, reuse with attribution and a link.

No value below was produced, estimated or completed by a language model. Every figure was read from a source we name, on the date we give.

The cheapest Gemini model we track, Gemini 2.5 Flash-Lite, costs $0.400 per million output tokens and an input price that depends on the type of content. The cheapest Grok model, grok-build-0.1, costs $2.00 per million output tokens and $1.00 per million input tokens. At the entry level, Gemini is 5.0 times cheaper than Grok on output tokens. Prices read on 18 September 2026.

## Gemini models

| Model | Input $/1M | Output $/1M | Read on |
|---|---|---|---|
| Gemini 2.5 Flash-Lite | by content type | $0.400 | 2026-09-18 |
| Gemini 3.1 Flash-Lite | by content type | $1.50 | 2026-09-18 |
| Gemini 2.5 Flash | by content type | $2.50 | 2026-09-18 |
| Gemini 3.5 Flash-Lite | by content type | $2.50 | 2026-09-18 |
| Gemini 3 Flash Preview | by content type | $3.00 | 2026-09-18 |
| Gemini 3.6 Flash | $0.750 | $3.75 | 2026-09-18 |
| Gemini 3.7 Flash | $0.750 | $3.75 | 2026-09-18 |
| Gemini 3.8 Flash | $0.750 | $3.75 | 2026-09-18 |
| Gemini Robotics ER 1.6 Preview | by content type | $5.00 | 2026-09-11 |
| Gemini Robotics ER 2 Preview | by content type | $5.00 | 2026-09-17 |
| Gemini Robotics ER 2 Streaming Preview | by content type | $5.00 | 2026-09-17 |
| Gemini 3.5 Flash | $1.50 | $9.00 | 2026-09-18 |

## Grok models

| Model | Input $/1M | Output $/1M | Read on |
|---|---|---|---|
| grok-build-0.1 | $1.00 | $2.00 | 2026-09-18 |
| grok-4.20-0309-non-reasoning | $1.25 | $2.50 | 2026-09-18 |
| grok-4.20-0309-reasoning | $1.25 | $2.50 | 2026-09-18 |
| grok-4.20-multi-agent-0309 | $1.25 | $2.50 | 2026-09-18 |
| grok-4.3 | $1.25 | $2.50 | 2026-09-18 |
| grok-4.5 | $2.00 | $6.00 | 2026-09-18 |
| grok-4.6 | $2.00 | $6.00 | 2026-09-18 |


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