API cost decision in 10 seconds

Gemini 2.5 Pro vs NewGrok 4.3

Pick Grok 4.3 for lower cost; pick Gemini 2.5 Pro only if the larger context window matters more.

Page updated: 2026-05-26T15:08:08Z Data confirmed: 2026-05-30T18:07:59Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Grok 4.3 for lower cost; pick Gemini 2.5 Pro only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Grok 4.3 is estimated at $2.5 vs $6.25 for Gemini 2.5 Pro, saving $3.75 (60% lower).

Cost-first pickGrok 4.3

Context-first pickGemini 2.5 Pro

Sample savings$3.7560%

10x traffic gap$37.5

Gemini 2.5 Pro has more context, but Grok 4.3 saves $3.75 on the standard workload. At 10x that traffic, the same price gap is about $37.5. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Grok 4.3 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Gemini 2.5 Pro	Grok 4.3
Input-heavy / RAG	5M input + 500K output	Grok 4.3	$11.25	$7.5
Balanced workload	1M input + 1M output	Grok 4.3	$11.25	$3.75
Output-heavy chatbot	1M input + 5M output	Grok 4.3	$51.25	$13.75

Cheaper input Tie $1.25 vs $1.25 / 1M

Both models report the same input price at $1.25 per 1M tokens.

Cheaper output Grok 4.3 $10 vs $2.5 / 1M

Grok 4.3 is $7.5 cheaper per 1M output tokens (75% lower; 4x difference).

Larger context Gemini 2.5 Pro 1.05M vs 1M

Gemini 2.5 Pro has 48.58K more context (1.05x larger).

Sample workload Grok 4.3 $6.25 vs $2.5

Grok 4.3 is $3.75 cheaper on the standard workload (60% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Gemini 2.5 Pro Calculating… Estimated API cost

Grok 4.3 Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

both models tie on input price; Grok 4.3 has the lower output price; Gemini 2.5 Pro offers the larger context window. For the 1M input plus 500K output sample, Grok 4.3 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $6.25 for Gemini 2.5 Pro and $2.5 for Grok 4.3.

Best Fit

Choose Gemini 2.5 Pro when you care most about larger context window.

Choose Grok 4.3 when you care most about lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, Grok 4.3 is estimated at $2.5 vs $6.25 for Gemini 2.5 Pro, saving $3.75 (60% lower).
Grok 4.3 is $3.75 cheaper on the standard workload (60% lower).
Both models report the same input price at $1.25 per 1M tokens.
Grok 4.3 is $7.5 cheaper per 1M output tokens (75% lower; 4x difference).
Gemini 2.5 Pro has 48.58K more context (1.05x larger).

Head-to-Head Specs

Feature	Gemini 2.5 Pro (Google)	NewGrok 4.3 (xAI)
Input Price prompt tokens per 1M	$1.25	$1.25
Completion Price per 1M tokens	$10	$2.5
Sample Workload Cost 1M input + 500K output	$6.25	$2.5
Context Window	1.05M	1M
Release Date	2025-06-17	2026-04-30
Popularity	#49	#53

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Grok 4.3	On the standard 1M input plus 500K output workload, Grok 4.3 is estimated at $2.5 vs $6.25 for Gemini 2.5 Pro, saving $3.75 (60% lower).
High-volume input processing	Tie	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Grok 4.3	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Gemini 2.5 Pro	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Gemma 4 31B (free) can replace Gemini 2.5 Pro when lower sample workload cost matters most: $0.
Gemma 4 26B A4B (free) can replace Gemini 2.5 Pro when lower sample workload cost matters most: $0.
Lyria 3 Clip Preview can replace Gemini 2.5 Pro when lower sample workload cost matters most: $0.
Lyria 3 Pro Preview can replace Gemini 2.5 Pro when lower sample workload cost matters most: $0.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
Owl Alpha offers 1.05M context with $0 sample workload cost.

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Cheaper alternatives

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Larger context alternatives

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Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

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Google catalog

Review all tracked Google models before deciding whether this matchup is the right shortlist.

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xAI catalog

Check other xAI models with comparable pricing, context, or release timing.

Open xAI models

Gemini 2.5 Pro

Gemini 2.5 Pro is Google’s state-of-the-art AI model designed for advanced reasoning, coding, mathematics, and scientific tasks. It employs “thinking” capabilities, enabling it to reason through responses with enhanced accuracy...

Grok 4.3

Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...