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Anthropic just updated the Claude model lineup. If you’re building with the API or just picking which model to use, here’s the current state.
Current models at a glance
| Opus 4.6 | Sonnet 4.6 | Haiku 4.5 | |
|---|---|---|---|
| API ID | claude-opus-4-6 | claude-sonnet-4-6 | claude-haiku-4-5-20251001 |
| Input price | $5 / MTok | $3 / MTok | $1 / MTok |
| Output price | $25 / MTok | $15 / MTok | $5 / MTok |
| Context | 1M tokens | 1M tokens | 200K tokens |
| Max output | 128K tokens | 64K tokens | 64K tokens |
| Extended thinking | Yes | Yes | Yes |
| Adaptive thinking | Yes | Yes | No |
| Knowledge cutoff | May 2025 | Aug 2025 | Feb 2025 |
| Training data | Aug 2025 | Jan 2026 | Jul 2025 |
| Latency | Moderate | Fast | Fastest |
What changed
- Opus 4.6 and Sonnet 4.6 both support extended thinking and adaptive thinking
- Sonnet 4.6 has a newer training data cutoff (Jan 2026) than Opus 4.6 (Aug 2025)
- Opus 4 and 4.1 are now legacy — still available but $15/$75 per MTok. Three times the price of 4.6 for less performance
- Haiku 3 is deprecated — retiring April 19, 2026
Legacy models — still available but consider migrating
| Opus 4.5 | Opus 4.1 | Opus 4 | Sonnet 4.5 | Sonnet 4 | |
|---|---|---|---|---|---|
| API ID | claude-opus-4-5 | claude-opus-4-1 | claude-opus-4-0 | claude-sonnet-4-5 | claude-sonnet-4-0 |
| Input | $5/MTok | $15/MTok | $15/MTok | $3/MTok | $3/MTok |
| Output | $25/MTok | $75/MTok | $75/MTok | $15/MTok | $15/MTok |
| Context | 200K | 200K | 200K | 1M | 1M |
Which one to pick
- Building agents or doing complex coding → Opus 4.6
- General purpose, good balance → Sonnet 4.6
- High volume, cost sensitive → Haiku 4.5
- Still on Opus 4 or 4.1 → migrate now, you’re paying 3x for less
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