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Model comparison · Updated 10 Oct 2026

Gemini 3.5 Flash vs Grok 4.3

Grok 4.3 is about 1.2× cheaper on input ($1.25 against $1.50 per 1M tokens) and on output. Gemini 3.5 Flash has the larger context window (1.05M against 1M tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $1,485 a month for Gemini 3.5 Flash and $788 for Grok 4.3.

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ModelsAtlas. “Gemini 3.5 Flash vs Grok 4.3”. Retrieved 10 Oct 2026. https://modelsatlas.com/compare/google/gemini-3-5/vs/xai/grok-4-3

Model A

Gemini 3.5 Flash

by Google · weights not marked open · GRIDE5

Input / 1M
$1.50
observed We measured
Source
Our catalogue
Retrieved
17 Aug 2026
Output / 1M$9.00
Context1.05M
vs

Model B

Grok 4.3

by xAI · weights not marked open · GRIDE5

Input / 1M
$1.25
observed We measured
Source
Our catalogue
Retrieved
17 Aug 2026
Output / 1M$2.50
Context1M

Key numbers

Standard tier · highlighted = better

Gemini 3.5 Flash
Grok 4.3
Input / 1M tokens
$1.50
$1.25
Output / 1M tokens
$9.00
$2.50
Batch input / output
$0.75 / $4.50
$1.00 / $2.00
Context window
1,048,576
1,000,000
Input types
Not disclosed
Not disclosed
Weights
Not marked open
Not marked open
Tiers listed
batch, standard
batch, standard
Prices checked
2026-08-17
2026-10-10

What it costs for real workloads

Monthly, standard tier, 30 days

Support chatbot10k chats/day · 1.5k in, 300 out
$1,485/mo
$788/mo
RAG over documents2k queries/day · 12k in, 500 out
$1,350/mo
$975/mo
Coding agent300 tasks/day · 60k in, 8k out
$1,458/mo
$855/mo

Gemini 3.5 Flash   Grok 4.3 · Derived from the standard-tier prices above, input and output tokens per request as stated, 30 days. Excludes caching discounts and batch. Try your own numbers.

On the atlas

Price band (A–H) × context band (1–6)

Same square. Gemini 3.5 Flash and Grok 4.3 share E5.

Same square as Gemini 3.5 Flash: Gemini 2.5 Pro Preview 06-05 ($1.25), Muse Spark 1.1 ($1.25), Muse Spark 1.2 ($1.25). Open E5

AFreeB<$0.10C$0.10–0.30D$0.30–1E$1–3F$3–10G$10–30H$30+1<32K232–128K3128–256K4256K–1M51M6>1MINPUT PRICE PER 1M TOKENS →CONTEXT WINDOW ↑ · position within a square follows the real valueGemini 2.5 Pro Preview 06-05 · E5Muse Spark 1.1 · E5Muse Spark 1.2 · E5Muse Spark 1.3 · E5Claude Sonnet 5 · E5Gemini 3.5 FlashGemini 3.5 FlashGrok 4.3Grok 4.3
Gemini 3.5 FlashGrok 4.3Nearest neighboursOpen weights
View the map as a table (1 squares)
SquarePrice bandContext bandModels
GRIDE5$1–31MGemini 3.5 Flash, Grok 4.3, Gemini 2.5 Pro Preview 06-05, Muse Spark 1.1, Muse Spark 1.2, Muse Spark 1.3, Claude Sonnet 5

Capabilities side by side

Only what our records list

Gemini 3.5 Flash
Grok 4.3
Vision input
Not disclosed
Not disclosed
Audio input
Not disclosed
Not disclosed
Open weights
Not marked open
Not marked open
Batch tier
Supported
Supported
Free tier
Not listed
Not listed
Thinking tier
Not listed
Not listed

Neither record lists input types, so we do not claim any.

Which should you choose?

Editorial

Choose Gemini 3.5 Flash if…

  • your prompts are long: it takes 1,048,576 tokens against 1,000,000
  • you will batch: its batch rate is 50% of standard against 80%

Choose Grok 4.3 if…

  • you pay by the token: it costs $1.25 per 1M input against $1.50
  • output dominates your bill: $2.50 per 1M output against $9.00

Each reason is a fact from the tables above. Picking between them is our judgement, and we do not benchmark quality: price and context are what we can measure, so test both on your own prompts before you commit.

Questions

Is Gemini 3.5 Flash better than Grok 4.3?
We do not benchmark quality, so we cannot say. On the recorded numbers: Grok 4.3 is about 1.2× cheaper on input ($1.25 against $1.50 per 1M tokens) and on output. Gemini 3.5 Flash has the larger context window (1.05M against 1M tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $1,485 a month for Gemini 3.5 Flash and $788 for Grok 4.3. Which is better for you depends on your task; test both on your own prompts.
Which is cheaper, Gemini 3.5 Flash or Grok 4.3?
Grok 4.3: $1.25 against $1.50 per 1M input tokens, and $2.50 against $9.00 per 1M output, on standard pricing.
How much does each cost per 1M tokens?
Gemini 3.5 Flash: $1.50 input and $9.00 output. Grok 4.3: $1.25 input and $2.50 output. Standard tier, USD.
Which has the larger context window?
Gemini 3.5 Flash, with 1,048,576 tokens. Grok 4.3 has 1,000,000 tokens.
Do both offer batch pricing?
Gemini 3.5 Flash lists a batch tier, at 50% of its standard price. Grok 4.3 lists a batch tier, at 80% of its standard price.
Can both read images or audio?
Input types recorded for Gemini 3.5 Flash: none recorded. For Grok 4.3: none recorded. Where a record lists none we say so rather than guess; check each vendor's documentation before relying on a capability.
Is either model open-weight?
Gemini 3.5 Flash: not marked open-weight in our records. Grok 4.3: not marked open-weight in our records.
What would each cost for a support chatbot?
At 10,000 chats a day, 1,500 input and 300 output tokens each, 30 days, standard tier: about $1,485 a month for Gemini 3.5 Flash and $788 for Grok 4.3. This is our calculation from the listed prices, not a quote.

About the two models

Gemini 3.5 Flash

By Google. $1.50 input and $9.00 output per 1M tokens, 1.05M context, atlas square E5. Tiers listed: batch, standard.

Full specs & pricing →

Grok 4.3

By xAI. $1.25 input and $2.50 output per 1M tokens, 1M context, atlas square E5. Tiers listed: batch, standard.

Full specs & pricing →

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