Last verified 2025-09-22 (left) · 2025-09-22 (right)
Claude Sonnet 3.7 (Legacy) vs o3 — Pricing & Capability Comparison
Claude Sonnet 3.7 (Legacy) charges $3.00 per million input tokens and $15.00 per million output tokens. o3 comes in at $2.00 / $8.00. Context windows span 200K vs 200K tokens respectively.
Input price (per 1M)
Claude Sonnet 3.7 (Legacy)
$3.00
o3
$2.00
o3 leads here
Output price (per 1M)
Claude Sonnet 3.7 (Legacy)
$15.00
o3
$8.00
o3 leads here
Context window
Claude Sonnet 3.7 (Legacy)
200,000 tokens
o3
200,000 tokens
Claude Sonnet 3.7 (Legacy) leads here
Cached input
Claude Sonnet 3.7 (Legacy)
Not published
o3
Not published
No published data
Cost comparison for 10K-token workloads
Side-by-side pricing for identical workloads (10,000 total tokens per request) across different distributions.
| Scenario | Claude Sonnet 3.7 (Legacy) | o3 |
|---|---|---|
Balanced conversation 50% input · 50% output | $0.0900 | $0.0500 |
Input-heavy workflow 80% input · 20% output | $0.0540 | $0.0320 |
Generation heavy 30% input · 70% output | $0.114 | $0.0620 |
Cached system prompt 90% cached input · 10% fresh output | $0.0420 | $0.0260 |
Frequently asked questions
Which model is cheaper per million input tokens?
o3 costs $2.00 per million input tokens versus $3.00 for Claude Sonnet 3.7 (Legacy).
How do output prices compare?
o3 charges $8.00 per million output tokens, while Claude Sonnet 3.7 (Legacy) costs $15.00 per million.
Which model supports a larger context window?
Claude Sonnet 3.7 (Legacy) offers 200,000 tokens (200K) versus 200K for o3.