Is Gemini 3.1 Pro cheaper than Grok 4.3?

Grok 4.3 is cheaper: roughly $1.63 vs $5.00 per 1M tokens (blended). Gemini 3.1 Pro: $2.00 in · $12 out / 1M tokens. Grok 4.3: $1.25 in · $2.50 out / 1M tokens.

Can I switch between Gemini 3.1 Pro and Grok 4.3 in the same agent?

Yes. Model-agnostic agents (Cline, Aider, OpenClaw, Hermes Agent, Kilo Code, OpenCode) let you swap models per task. Many people route hard tasks to the stronger model and routine work to the cheaper one.

Gemini 3.1 Pro vs Grok 4.3: Which AI Model Is Better? (2026)

Q: Gemini 3.1 Pro vs Grok 4.3: which is better for agents?

Gemini 3.1 Pro scores higher on output quality (6.4/10 vs 5.7/10), while Grok 4.3 is the cheaper option. Gemini 3.1 Pro is best for long multimodal inputs and Gemini CLI setups that still pin 3.1 Pro; Grok 4.3 is best for simple, long-context calls in existing Grok setups. Live community votes on this page show what people actually prefer.

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality

Correctness and depth of what it produces

Agentic Ability

Tool calls, instruction-following, and multi-step tasks

Speed

Tokens per second and time-to-first-token

Value for Money

How much capability you get per dollar

Reliability

Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec

Gemini 3.1 Pro

Grok 4.3

Maker

Google

xAI

Blended price / 1M

$5.00

$1.63

Input / output

$2.00 in · $12 out / 1M tokens

$1.25 in · $2.50 out / 1M tokens

Context window

1.0M

Open weights

Tool use

Yes

Reasoning

Yes

Output Quality

6.4

5.7

Agentic Ability

5.2

4.4

Speed

8.5

8.0

Value for Money

4.3

4.4

Reliability

8.5

8.4

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: Gemini 3.1 Pro or Grok 4.3?

Updated 2026-10-17

Choose Gemini 3.1 Pro if you want long multimodal inputs and Gemini CLI setups that still pin 3.1 Pro. Choose Grok 4.3 if you want simple, long-context calls in existing Grok setups.

In our editorial scoring, Gemini 3.1 Pro leads in 4 of five dimensions (output quality, agentic ability, speed and reliability), while Grok 4.3 leads in 1. On price, Gemini 3.1 Pro runs about $5.00 per 1M tokens (blended) and is proprietary; Grok 4.3 is about $1.63 and proprietary.

Where Gemini 3.1 Pro falls short