Model Watch · Anthropic
The cheap end of the Claude line, and the only current one still on a 200K window rather than a million.
Claude Haiku 4.5 is a model from Anthropic, built in the US. It's out, and you can call it today.
Anthropic released it on 15 October 2025. That date comes from the lab's own docs.
The tracker first logged the name on 18 August 2026 and last saw it on 19 August 2026.
| Lab | Anthropic |
|---|---|
| Built in | US |
| Status | released |
| API model id | claude-haiku-4-5-20251001 |
| Released | 15 October 2025 |
| Context window | 200K tokens |
| Max output | 64K tokens |
| Input, per 1M tokens | $1.00 |
| Output, per 1M tokens | $5.00 |
List prices per million tokens, read off the lab's own docs. Caching, batching and volume deals all cut the real number, so treat this as the ceiling. Check the source before you budget against it.
| Model | Status | Date | Context | In / 1M | Out / 1M |
|---|---|---|---|---|---|
| Claude Haiku 4.5 | released | 15 October 2025 | 200K tokens | $1.00 | $5.00 |
| Claude Mythos 5.1 | released | 1 September 2026 | 1M tokens | $10.00 | $50.00 |
| Claude Fable 5.1 | released | 1 September 2026 | 1M tokens | $10.00 | $50.00 |
| Claude Opus 5 | released | 24 July 2026 | 1M tokens | $5.00 | $25.00 |
| Claude Sonnet 5 | released | 30 June 2026 | 1M tokens | $2.00 | $10.00 |
| Claude Fable 5 | released | 9 June 2026 | 1M tokens | $10.00 | $50.00 |
| Claude Opus 4.5 | released | 24 November 2025 | 200K tokens | $5.00 | $25.00 |
| Claude Sonnet 4.5 | released | 29 September 2025 | 200K tokens | $3.00 | $15.00 |
| Claude Opus 5.1 | rumoured | — | — | — | — |
| Claude Opus 4.1 | deprecated | — | — | $15.00 | $75.00 |
A dash means the lab hasn't published that number for that model.
We tracked 5 public discussions naming Claude Haiku 4.5 across r/ClaudeAI and r/ClaudeCode between 12 August 2026 and 1 September 2026.
The subject that came up most was agents and tool use and using it to write code. A discussion can cover several, so these add up to more than 5.
| What people are discussing | Threads |
|---|---|
| agents and tool use | 1 |
| using it to write code | 1 |
Every tracked post, release, changelog entry or incident whose title or summary names Claude Haiku 4.5. Newest first, each one linking to where the lab published it.
Aug 19 , 11:02 UTC Resolved - This incident has been resolved. Aug 19 , 10:33 UTC Monitoring - A fix has been implemented and we are monitoring the results. Aug 19 , 09:42 UTC Identified - We have identified the cause of elevated errors on requests to Claude Opus 5 and Claude Haiku 4.5 and are working on a fix. We will provide an update as soon as possible.
Aug 18 , 19:01 UTC Resolved - The issue affecting Claude Opus 5 has been resolved. Impact occurred from 16:11 to 18:23 UTC. Aug 18 , 18:26 UTC Monitoring - A fix has been implemented and we are monitoring the results. Aug 18 , 17:12 UTC Update - We are investigating elevated errors on requests to Claude Opus 5. We will provide an update as soon as possible. Aug 18 , 16:20 UTC Update - We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, Claude Sonnet 5, Claude Haiku 4.5, and other Claude models. We will provide an update as soon as possible. Aug…
The release timeline is every model we know about, filterable by lab, country and date. The tracker is the live feed these mentions come from, and Model Watch is the whole catalogue on one page.
More from Anthropic:
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