# Claude 4.5 Sonnet release · 2025-09-29 · snapshot 2026-10-26

Creator: Anthropic · 2 effort levels

| Effort level | Input modalities | Intelligence | Total cost | E2E | On the frontier today | ID |
|---|---|---|---|---|---|---|
| Claude 4.5 Sonnet (Reasoning) | Text, Image | 20.70 | $1501 | 21.0s | no | `claude-4-5-sonnet-thinking` |
| Claude 4.5 Sonnet (Non-reasoning) | Text, Image | 19.30 | - | 12.1s | no | `claude-4-5-sonnet` |

## Launch day (2025-09-29)

- Reached the frontier: 1 of 2
- Impact (intelligence × log-cost hypervolume gained): 4.39
- Rank: did not move the frontier; 46 releases this past year did


> Metrics snapshot: 2026-10-26T03:27:40Z. Intelligence index version: unknown. Release timeline, frontier age, release impact and shakeup cards are reconstructions using one selected snapshot's metrics, not a record of what was known at release. Scores, benchmark cost and derived value may change when the index methodology changes. Source documentation advertises v4.3.2; API correspondence is unverified.