# Pi v0.79.1: Claude Fable 5 support, project trust defaults, extension autocomplete triggers

> Pi adds Claude Fable 5 on Anthropic and Bedrock providers (adaptive thinking, xhigh effort), makes project trust behavior configurable, and lets extension autocomplete providers open without a slash-command prefix. A long list of inherited provider and UI fixes round out the release.

| | |
|---|---|
| **Tool** | Pi |
| **Version** | v0.79.1 |
| **Kind** | release |
| **Published** | 2026-06-09 |
| **Observed** | 2026-08-21 |
| **Significance** | 4/5 |
| **Breaking** | no |
| **Categories** | feature, model-support, fix |

## What changed


**New capabilities**
- Claude Fable 5 available on Anthropic and Amazon Bedrock providers, with adaptive thinking and `xhigh` effort support (inherited from `@earendil-works/pi-ai`).
- Prompt templates support default positional arguments such as `${1:-7}` for optional values. ([#5553](https://github.com/earendil-works/pi/pull/5553))
- New `defaultProjectTrust` setting: unresolved project-trust asks default to ask / always-trust / never-trust; extensions can inspect the effective decision via `ctx.isProjectTrusted()`. ([#5523](https://github.com/earendil-works/pi/issues/5523))
- Extension autocomplete providers can declare trigger characters (e.g. `#` or `$`) so suggestions open without slash-command prefixes. ([#4703](https://github.com/earendil-works/pi/issues/4703))
- Added `areExperimentalFeaturesEnabled` feature guard to opt in to early features. ([#5547](https://github.com/earendil-works/pi/pull/5547))

**Fixed (selected)**
- Bedrock inference profile ARN region resolution prefers the ARN's embedded region over `AWS_REGION`. ([#5527](https://github.com/earendil-works/pi/pull/5527))
- Azure GPT-5.4/5.5 context window corrected to 1,050,000 tokens; GPT-5 Pro `maxTokens` corrected to 128k. ([#5559](https://github.com/earendil-works/pi/issues/5559))
- Various thinking-off compatibility params for z.ai / Moonshot Kimi; Azure OpenAI Responses disables server-side storage. ([#5330](https://github.com/earendil-works/pi/issues/5330), [#5531](https://github.com/earendil-works/pi/issues/5531), [#5530](https://github.com/earendil-works/pi/issues/5530))
- IME hardware cursor positioning with slash-command autocomplete visible; mixed Latin/CJK text wrapping at grapheme boundaries. ([#5283](https://github.com/earendil-works/pi/pull/5283), [#5495](https://github.com/earendil-works/pi/issues/5495))


## Sources

- [github_release](https://github.com/earendil-works/pi/releases/tag/v0.79.1) — retrieved 2026-08-21


## Community

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---
Canonical: https://changelogs.info/pi/v0-79-1
Entity: https://changelogs.info/pi
Event ID: `evt_2026-06-09_pi_v0-79-1`
Licence: event synthesis © changelogs.info, CC BY 4.0. Linked sources belong to their vendors.