Claude 3.5 Sonnet vs Claude Opus 4.5: Specs & Benchmark Comparison
| Characteristic | Claude 3.5 Sonnet | Claude Opus 4.5 |
|---|---|---|
| Company | Anthropic | Anthropic |
| Release Date | June 21, 2024 | November 23, 2025 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 200K | 200K |
| Context (output) | 200K | 64K |
| Input Price / 1M | $3.00 | $5.00 |
| Output Price / 1M | $15.00 | $25.00 |
| Average Score | 0.8 | 0.9 |
| Benchmarks | ||
| GPQA | 0.6 | 0.9 |
Visual Benchmark Comparison
Claude 3.5 Sonnet
Claude Opus 4.5
GPQA0.6 vs 0.9
0.6
0.9
Verdict
Both models show equal results — the choice depends on your specific use case.
Overall Performance
Both models show comparable average scores: Claude 3.5 Sonnet — 0.8, Claude Opus 4.5 — 0.9.
API Cost
Claude 3.5 Sonnet is 1.7x cheaper: input $3.00/1M vs $5.00/1M tokens.
Context Window
Same context size: 200K tokens.
Recency
Claude Opus 4.5 is newer: released 11/23/2025 vs 6/21/2024.
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Frequently Asked Questions
Which is better for coding — Claude 3.5 Sonnet or Claude Opus 4.5?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude 3.5 Sonnet or Claude Opus 4.5?
Claude 3.5 Sonnet is cheaper for input: $3.00 per 1M tokens vs $5.00.
Which has a larger context window — Claude 3.5 Sonnet or Claude Opus 4.5?
Claude 3.5 Sonnet supports a larger context: 200,000 tokens vs 200,000.
The Claude 3.5 Sonnet and Claude Opus 4.5 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude 3.5 Sonnet or Claude Opus 4.5 page. See also the complete list of AI model comparisons.