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Model comparison · Updated 10 Oct 2026

Claude Sonnet 5 vs Grok 4.3

Grok 4.3 is about 1.6× cheaper on input ($1.25 against $2.00 per 1M tokens) and on output. Both have a 1M-token context window. For a support chatbot at 10,000 chats a day, the standard-tier bill is about $1,800 a month for Claude Sonnet 5 and $788 for Grok 4.3.

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ModelsAtlas. “Claude Sonnet 5 vs Grok 4.3”. Retrieved 10 Oct 2026. https://modelsatlas.com/compare/anthropic/claude-sonnet-5/vs/xai/grok-4-3

Model A

Claude Sonnet 5

by Anthropic · weights not marked open · GRIDE5

Input / 1M
$2.00
asserted Vendor states
Source
docs.anthropic.com/en/docs/about-claude/pricing
Retrieved
17 Aug 2026
Output / 1M$10.00
Context1M
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

Claude Sonnet 5
Grok 4.3
Input / 1M tokens
$2.00
$1.25
Output / 1M tokens
$10.00
$2.50
Batch input / output
$1.00 / $5.00
$1.00 / $2.00
Context window
1,000,000
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
$1,800/mo
$788/mo
RAG over documents2k queries/day · 12k in, 500 out
$1,740/mo
$975/mo
Coding agent300 tasks/day · 60k in, 8k out
$1,800/mo
$855/mo

Claude Sonnet 5   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. Claude Sonnet 5 and Grok 4.3 share E5.

Same square as Claude Sonnet 5: 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 valueClaude Sonnet 5.5 · E5Gemini 3.1 Pro Preview · E5Gemini 3.1 Pro Preview Custom Tools · E5GPT-4.1 · E5Qwen3.8 2.4T A95B · E5Gemini 3.5 Flash · E5Gemini 2.5 Pro Preview 06-05 · E5Muse Spark 1.1 · E5Muse Spark 1.2 · E5Muse Spark 1.3 · E5Claude Sonnet 5Claude Sonnet 5Grok 4.3Grok 4.3
Claude Sonnet 5Grok 4.3Nearest neighboursOpen weights
View the map as a table (1 squares)
SquarePrice bandContext bandModels
GRIDE5$1–31MClaude Sonnet 5, Grok 4.3, Claude Sonnet 5.5, Gemini 3.1 Pro Preview, Gemini 3.1 Pro Preview Custom Tools, GPT-4.1, Qwen3.8 2.4T A95B, Gemini 3.5 Flash, Gemini 2.5 Pro Preview 06-05, Muse Spark 1.1, Muse Spark 1.2, Muse Spark 1.3

Capabilities side by side

Only what our records list

Claude Sonnet 5
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 Claude Sonnet 5 if…

  • 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 $2.00
  • output dominates your bill: $2.50 per 1M output against $10.00

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 Claude Sonnet 5 better than Grok 4.3?
We do not benchmark quality, so we cannot say. On the recorded numbers: Grok 4.3 is about 1.6× cheaper on input ($1.25 against $2.00 per 1M tokens) and on output. Both have a 1M-token context window. For a support chatbot at 10,000 chats a day, the standard-tier bill is about $1,800 a month for Claude Sonnet 5 and $788 for Grok 4.3. Which is better for you depends on your task; test both on your own prompts.
Which is cheaper, Claude Sonnet 5 or Grok 4.3?
Grok 4.3: $1.25 against $2.00 per 1M input tokens, and $2.50 against $10.00 per 1M output, on standard pricing.
How much does each cost per 1M tokens?
Claude Sonnet 5: $2.00 input and $10.00 output. Grok 4.3: $1.25 input and $2.50 output. Standard tier, USD.
Which has the larger context window?
Neither: both have 1,000,000 tokens.
Do both offer batch pricing?
Claude Sonnet 5 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 Claude Sonnet 5: 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?
Claude Sonnet 5: 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 $1,800 a month for Claude Sonnet 5 and $788 for Grok 4.3. This is our calculation from the listed prices, not a quote.

About the two models

Claude Sonnet 5

By Anthropic. $2.00 input and $10.00 output per 1M tokens, 1M 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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