Claude Opus 4.5 vs Claude Sonnet 4.5 (2025-09-29)

Name: Claude Sonnet 4.5 (2025-09-29)
Brand: Anthropic
Price: 3.000000 USD

Claude Opus 4.5 vs Claude Sonnet 4.5 (2025-09-29): Claude Sonnet 4.5 (2025-09-29) is cheaper by 40% on average. Claude Opus 4.5 from Azure AI Foundry (200,000-token context, reasoning, tool calls) vs. Claude Sonnet 4.5 (2025-09-29) from Anthropic (200,000-token context, reasoning, tool calls). Use Agent Command Center to A/B both in shadow mode and pick the winner per workload.

Side-by-side cost

Live workload comparison

Same workload run through both models. The cheaper one is highlighted.

Input tokens / request3,000

0200,000

Output tokens / request400

064,000

Requests / day5,000

01,000,000

Claude Opus 4.5

Azure AI Foundry

$3,805/mo

Input $5.00/M · Output $25.00/M

Claude Sonnet 4.5 (2025-09-29)Cheaper

Anthropic

$2,283/mo

Input $3.00/M · Output $15.00/M

At this workload, Claude Sonnet 4.5 (2025-09-29) is 40% cheaper than Claude Opus 4.5 — a savings of $1,522/month ($18,263/year).

Production recipe — Agent Command Center

strategy: cost-optimized
primary:
  model: claude-sonnet-4-5-20250929
  provider: anthropic
fallback:
  model: claude-opus-4-5
  provider: azure-ai-foundry
shadow: { sample_rate: 0.05 }   # mirror 5% of traffic to compare quality live

Get started free →Routing docs ↗

	Claude Opus 4.5 Azure AI Foundry	Claude Sonnet 4.5 (2025-09-29) Anthropic
Input price	$5.00/M	$3.00/M
Output price	$25.00/M	$15.00/M
Context window	200,000	200,000
Max output	64,000	64,000
Function calling	✓	✓
Vision	✓	✓
Audio input	—	—
Reasoning	✓	✓
Prompt caching	✓	✓
Structured output	✓	✓
Pricing verified	May 12, 2026	May 12, 2026