Head to head
GPT-5 vs Claude Sonnet 4
GPT-5: legacyClaude Sonnet 4: retiredheavy tier
Verdict · modelled basis
GPT-5 costs 2.7x less per solved task.
On output token price alone, GPT-5 looks 1.5x cheaper (2.4x on input). The ranking holds, but the margin changes.
Source: Aider polyglot benchmark · verified 2026-08-21 · prices from each provider's pricing page
Input $/M tokens
lower is better
Output $/M tokens
lower is better
Cost per solved task
modelled basis · lower is better
| GPT-5 | Claude Sonnet 4 | |
|---|---|---|
| Input $/Mtok | $1.25 | $3 |
| Output $/Mtok | $10 | $15 |
| Cached input $/Mtok | $0.125 | $0.3 |
| Pass rate | 88% | 61% |
| Pass rate source | Aider | Aider |
| Cost basis | modelled | modelled |
| Cost per solved task | $1.66 | $4.40 |
verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· GPT-5· Claude Sonnet 4