Claude Sonnet 4 vs Claude Sonnet 4.5.
model vs model · prices as of
Claude Sonnet 4.5 takes 1 of 5 rounds against Claude Sonnet 4. It is also the cheaper of the two to run, at $20.61 per million tokens against $24.
AnthropicClaude Sonnet 4
$24/M tokens
Anthropic list price, nothing below it is accounted for · $2.70 per 1,000 pages
1M context · tool calling · reads images
Anthropicwins 1 roundsClaude Sonnet 4.5
$20.61/M tokens
cheapest we can explain, at Poe · $2.32 per 1,000 pages
1M context · tool calling · reads images
List price in (lower wins)
$3/M
$3/M
List price out (lower wins)
$15/M
$15/M
Cheapest we can explain (lower wins)
none below list
$20.61/M at Poe
Standard price (lower wins)
$24/M
$24/M
Cost per 1,000 pages (lower wins)
$2.70
$2.32
Context
1M tokens
1M tokens
Open weights
not stated
no
Tool calling
yes
yes
Structured output
no
yes
Reads images
yes
yes
Reasoning
yes
yes
Released
22 May 2025
29 Sept 2025
Providers selling it
3
39
Price we measure against
the maker's own
the maker's own
Trains on your prompts (no is better)
no provider to check
not stated
Providers selling both · 2
- Anthropic$24 / $24
Eden AI$26.40 / $24
Claude Sonnet 4 then Claude Sonnet 4.5, per million tokens
Go further
Add a third or fourth model, or switch the weighting, in the tool.
What moved in the last seven days
- Claude Sonnet 4.5
Nous Portal$2.40 / $12 $3 / $1525% dearer · - Claude Sonnet 4.5
Requesty$3.30 / $16.50 $3 / $159% cheaper ·
Frequently asked
- Which is cheaper, Claude Sonnet 4 or Claude Sonnet 4.5?
- Claude Sonnet 4.5, at $20.61 per million tokens against $24 for Claude Sonnet 4, three parts input to one part output, read on 16 Sept 2026.
- Where is each one cheapest?
- Claude Sonnet 4: nobody goes below the maker's own price with a reason we can point at, so $24 is the number to beat. Claude Sonnet 4.5: $20.61 at Poe.
- Can I buy both from one provider?
- Yes. 2 providers sell both: Anthropic, Eden AI. The cheapest of them for the two together is Anthropic.
- Which holds more context?
- Both hold 1M tokens in one call.
Prices exclude tax and are per million tokens, read 16 Sept 2026 from each provider's own catalog. The standard price blends three parts input to one part output; a page is 600 tokens in and 60 out. Bars are scaled to the larger value in each row.