Neither wins outright: Anthropic: Claude Sonnet 4.5 is the pick when you need structured output (JSON schema), Pareto 26.10 when cost matters at scale.
Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.
Workload (per month)
Anthropic: Claude Sonnet 4.5
Pareto 26.10
Difference
Customer-support chatbot
50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens)
$525
$124
Pareto 26.10 saves $401
RAG search over documents
20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens)
$510
$128
Pareto 26.10 saves $382
Coding / tool-using agent
2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens)
$540
$134
Pareto 26.10 saves $406
Batch summarisation
10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens)
$330
$83.20
Pareto 26.10 saves $247
Long-document analysis
500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens)
$165
$43.20
Pareto 26.10 saves $122
Capabilities side by side
Capability
Anthropic: Claude Sonnet 4.5
Pareto 26.10
What it lets you do
Tool / function calling
✓ Yes
✓ Yes
call your APIs and run agent loops
Structured output (JSON schema)
✓ Yes
—
return JSON that validates against your schema
Reasoning / thinking mode
✓ Yes
—
spend extra tokens thinking before answering hard problems
Image input
✓ Yes
✓ Yes
read screenshots, charts and scanned pages
Audio input
—
—
take speech or audio directly
File / PDF input
✓ Yes
—
accept documents without your own parsing step
Image output
—
—
generate images, not just text
Built-in web search
✓ Yes
—
answer from live web results
Seed (reproducible sampling)
—
—
repeat a generation for tests and evals
Log-probabilities
—
—
read token confidence for classification and scoring
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
Price history
Anthropic: Claude Sonnet 4.5: price unchanged since we started tracking it on 2026-03-10.
Pareto 26.10: price unchanged since we started tracking it on 2026-10-18.
Which should you choose?
Choose Anthropic: Claude Sonnet 4.5 if…
you need structured output (JSON schema) — to return JSON that validates against your schema; Pareto 26.10 does not advertise it
you need reasoning / thinking mode — to spend extra tokens thinking before answering hard problems; Pareto 26.10 does not advertise it
you need file / PDF input — to accept documents without your own parsing step; Pareto 26.10 does not advertise it
you need built-in web search — to answer from live web results; Pareto 26.10 does not advertise it
Choose Pareto 26.10 if…
cost matters at scale — it is 77% cheaper on a typical 3:1 input/output mix ($124 vs $525 a month for 50,000 support chats)
you generate long outputs in one go — up to 131K tokens (about 98,300 words) per response
you want the newer model — released 2026-10-15, 13 months after the other
Frequently asked questions
Is Anthropic: Claude Sonnet 4.5 better than Pareto 26.10?
Neither wins outright: Anthropic: Claude Sonnet 4.5 is the pick when you need structured output (JSON schema), Pareto 26.10 when cost matters at scale. In short: Anthropic: Claude Sonnet 4.5 when you need structured output (JSON schema), you need reasoning / thinking mode, you need file / PDF input, you need built-in web search; Pareto 26.10 when cost matters at scale, you generate long outputs in one go, you want the newer model.
Which is cheaper, Anthropic: Claude Sonnet 4.5 or Pareto 26.10?
Pareto 26.10 is cheaper: $1.40 vs $6.00 per 1M tokens at a typical 3:1 input/output mix, 77% less. For 50,000 support conversations a month that is $124 against $525.
How much do Anthropic: Claude Sonnet 4.5 and Pareto 26.10 cost per million tokens?
Anthropic: Claude Sonnet 4.5 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens; Pareto 26.10 costs $0.80 input and $3.20 output. Output tokens are billed separately, so long answers shift the gap.
Which has the bigger context window, Anthropic: Claude Sonnet 4.5 or Pareto 26.10?
Pareto 26.10: 1.0M tokens, about 1,573 pages, against 1M (about 1,500 pages) for Anthropic: Claude Sonnet 4.5.
Do Anthropic: Claude Sonnet 4.5 and Pareto 26.10 support function calling and JSON output?
Tool calling — Anthropic: Claude Sonnet 4.5: yes, Pareto 26.10: yes. JSON-schema structured output — Anthropic: Claude Sonnet 4.5: yes, Pareto 26.10: not advertised.
Can Anthropic: Claude Sonnet 4.5 or Pareto 26.10 read images?
Yes, both accept image input.
Is Anthropic: Claude Sonnet 4.5 or Pareto 26.10 free to use?
No free variant is listed for either; both are pay-per-token.
What is the maximum output length of Anthropic: Claude Sonnet 4.5 and Pareto 26.10?
Anthropic: Claude Sonnet 4.5 can write up to 64K tokens (about 48,000 words) per response; Pareto 26.10 up to 131K (about 98,300 words).
When were Anthropic: Claude Sonnet 4.5 and Pareto 26.10 released?
Anthropic: Claude Sonnet 4.5 was listed on 2025-09-29; Pareto 26.10 on 2026-10-15.
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Pareto is a multimodal composite model built for research, coding, and agentic workflows, while delivering frontier-level performance across a broad range of general-purpose tasks.