# Newsletter September 23, 2026: updates on the tools we follow | Apps

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# Newsletter September 23, 2026

 Daily update on the software we track here · automatically compiled, manually correctable
 How this is created. This page is automatically populated daily from public sources (X, Hacker News, GitHub, YouTube). The headlines come from the source, the Dutch sentence below is machine‑generated. Click through to the source before basing anything on it.

 
## Claude Code & agents

 
 
- [Claude Opus 5.5 rejected: Claude Code 2.1.280 or newer required](https://github.com/griffinmartin/opencode-claude-auth/issues/284) · GitHub · 2026-09-22An error message indicating that Claude Opus 5.5 is rejected unless Claude Code 2.1.280 or newer is used; relevant because an indie developer needs the correct runtime version.
 
- [No released SDK supports claude-opus-5-5: newest wheel (0.2.157) bundles CLI 2.1.277, model requires 2.1.280+](https://github.com/anthropics/claude-agent-sdk-python/issues/1281) · GitHub · 2026-09-22A notice that no available SDK supports the required version for Claude‑Opus‑5‑5, because the newest wheel 0.2.157 only includes CLI 2.1.277; relevant because the developer needs to find a compatible SDK.
 
 
## Repo's, releases & updates

 
 
- [fix(claude): update spoofed cli version to 2.1.280 for Opus 5.5 support](https://github.com/decolua/9router/pull/4262) · GitHub · 2026-09-23A patch that updates the spoofed CLI version to 2.1.280 to support Claude Opus 5.5; relevant because this restores compatibility for indie projects.
 
- [feat(models): add opus 5.5 without changing existing aliases](https://github.com/pingdotgg/t3code/pull/13094) · GitHub · 2026-09-22An addition that makes the Opus 5.5 model available without altering existing aliases; relevant because indie developers can now select the new model.
 
- [feat(models): support GPT-6 Sol, Luna and Claude Opus 5.5](https://github.com/Wei-Shaw/sub2api/pull/7509) · GitHub · 2026-09-22An extension that adds support for GPT‑6 Sol, Luna, and Claude Opus 5.5; relevant because indie developers can use multiple new models.
 
- [feat(claude): add Claude Opus 5.5 to the model catalog](https://github.com/getpaseo/paseo/pull/5191) · GitHub · 2026-09-22An update that adds Claude Opus 5.5 to the model catalog; relevant because indie developers can now find and deploy the model.
 
 
## Previous editions

 
 
- [22 september 2026](/en/nieuwsbrief-2026-09-22)
 
- [21 september 2026](/en/nieuwsbrief-2026-09-21)
 
- [20 september 2026](/en/nieuwsbrief-2026-09-20)
 
- [19 september 2026](/en/nieuwsbrief-2026-09-19)
 
- [18 september 2026](/en/nieuwsbrief-2026-09-18)
 
- [17 september 2026](/en/nieuwsbrief-2026-09-17)
 
- [16 september 2026](/en/nieuwsbrief-2026-09-16)
 
- [15 september 2026](/en/nieuwsbrief-2026-09-15)
 
- [14 september 2026](/en/nieuwsbrief-2026-09-14)
 
- [13 september 2026](/en/nieuwsbrief-2026-09-13)
 
- [12 september 2026](/en/nieuwsbrief-2026-09-12)
 
- [11 september 2026](/en/nieuwsbrief-2026-09-11)
 
- [10 september 2026](/en/nieuwsbrief-2026-09-10)
 
- [9 september 2026](/en/nieuwsbrief-2026-09-09)