# Claude: what I've logged

> Claude comes up in 11 posts of my AI log, from September 2025 to October 2026, and each item below links to the primary source. The sources come from Anthropic, filed under frontier, open weights and image, video, world.

## Items

1. **Claude Haiku 5.5** (Anthropic, 5 Oct 2026): The small Claude is cheaper at $0.10 in and $0.50 out per million tokens under 100K, and gets effort controls and adaptive thinking for the first time. [Primary source](https://www.anthropic.com/claude-haiku-5-5) · [Post](https://heyaliasif.com/ai/2026-10-05-week-in-ai#item-2)
2. **Claude Sonnet 5.5** (Anthropic, 28 Sept 2026): The second Claude 5.5 model is faster and cheaper than Opus 5.5, at $2 in and $10 out per million tokens, aimed at everyday coding and polished documents. [Primary source](https://www.anthropic.com/claude-sonnet-5-5) · [Post](https://heyaliasif.com/ai/2026-09-28-week-in-ai#item-2)
3. **Claude Frontier Academy** (Anthropic, 28 Sept 2026): A $100 million commitment to train 10,000 Frontier Deployed Engineers by the end of 2027, with firms like Accenture, Bain, Deloitte and McKinsey in the first cohorts. [Primary source](https://www.anthropic.com/news/claude-frontier-academy) · [Post](https://heyaliasif.com/ai/2026-09-28-week-in-ai#item-9)
4. **Claude Opus 5.5** (Anthropic, 21 Sept 2026): The first Claude 5.5 model matches Fable 5.1 on most tasks at $4 in and $20 out per million tokens, with typical workloads about 40% cheaper than Opus 5. [Primary source](https://www.anthropic.com/claude-opus-5-5) · [Post](https://heyaliasif.com/ai/2026-09-21-week-in-ai#item-1)
5. **Claude discovers a novel enzyme system with CRISPR-like repeats** (Anthropic, 21 Sept 2026): About 950 Claude agents searched a DNA database for 21 hours and flagged an uncharacterized array-associated reverse transcriptase system that lab work then confirmed. [Primary source](https://www.anthropic.com/news/claude-discovers-novel-enzyme-system) · [Post](https://heyaliasif.com/ai/2026-09-21-week-in-ai#item-5)
6. **Claude Fable 5.1 and Claude Mythos 5.1** (Anthropic, 31 Aug 2026): One underlying model at two safeguard levels, with cache reads 75% cheaper and base prices unchanged at $10 in and $50 out per million tokens. [Primary source](https://www.anthropic.com/claude-fable-and-mythos-5-1) · [Post](https://heyaliasif.com/ai/2026-08-31-week-in-ai#item-1)
7. **Claude Opus 5** (Anthropic, 20 Jul 2026): Anthropic's new flagship for agentic coding and long-horizon work, with a 1M-token context, 128K output and five effort settings that control how hard it thinks. [Primary source](https://www.anthropic.com/news/claude-opus-5) · [Post](https://heyaliasif.com/ai/2026-07-20-week-in-ai#item-1)
8. **Claude Sonnet 4.6** (Anthropic, 16 Feb 2026): The mid-tier Claude gets a major upgrade, bringing near-flagship coding and computer-use skill to the cheaper model. [Primary source](https://www.anthropic.com/news/claude-sonnet-4-6) · [Post](https://heyaliasif.com/ai/2026-02-16-week-in-ai#item-1)
9. **Claude Code Security** (Anthropic, 16 Feb 2026): A limited preview that scans codebases for vulnerabilities and suggests patches for human review. [Primary source](https://www.anthropic.com/news/claude-code-security) · [Post](https://heyaliasif.com/ai/2026-02-16-week-in-ai#item-5)
10. **Claude Opus 4.6** (Anthropic, 2 Feb 2026): Anthropic's new top model, stronger at long agentic work and offering a 1M-token context window in beta. [Primary source](https://www.anthropic.com/news/claude-opus-4-6) · [Post](https://heyaliasif.com/ai/2026-02-02-week-in-ai#item-1)
11. **Claude Cowork (research preview)** (Anthropic, 12 Jan 2026): Claude Code's agent approach, packaged for non-developers: point it at a folder and it works on the files. [Primary source](https://claude.com/blog/cowork-research-preview) · [Post](https://heyaliasif.com/ai/2026-01-12-week-in-ai#item-1)
12. **Claude Haiku 4.5** (Anthropic, 13 Oct 2025): A small model that Anthropic says matches Sonnet 4 on coding at about a third of the cost and twice the speed. [Primary source](https://www.anthropic.com/news/claude-haiku-4-5) · [Post](https://heyaliasif.com/ai/2025-10-13-week-in-ai#item-1)
13. **Equipping agents with Agent Skills** (Anthropic, 13 Oct 2025): Skills are folders of instructions and scripts that Claude loads only when a task needs them. [Primary source](https://www.anthropic.com/news/skills) · [Post](https://heyaliasif.com/ai/2025-10-13-week-in-ai#item-2)
14. **Claude Sonnet 4.5** (Anthropic, 29 Sept 2025): Anthropic's new coding and agent model, which it says can hold focus on complex tasks for more than 30 hours. [Primary source](https://www.anthropic.com/news/claude-sonnet-4-5) · [Post](https://heyaliasif.com/ai/2025-09-29-week-in-ai#item-1)
15. **Building agents with the Claude Agent SDK** (Anthropic, 29 Sept 2025): The Claude Code SDK is renamed and opened up as a general toolkit for building agents. [Primary source](https://www.anthropic.com/engineering/building-agents-with-the-claude-agent-sdk) · [Post](https://heyaliasif.com/ai/2025-09-29-week-in-ai#item-2)
16. **Claude can now create and edit files** (Anthropic, 8 Sept 2025): Claude produces real Excel, Word, PowerPoint and PDF files inside a sandbox, as a preview feature. [Primary source](https://www.anthropic.com/news/create-files) · [Post](https://heyaliasif.com/ai/2025-09-08-week-in-ai#item-1)

## Posts

- 2026-10-05 [Mistral Large 4, Claude Haiku 5.5 and a wave of decision models](https://heyaliasif.com/ai/2026-10-05-week-in-ai)
- 2026-09-28 [Gemini 4 Argon debuts to cyber defenders, Sonnet 5.5, GPT-6.1 Sol](https://heyaliasif.com/ai/2026-09-28-week-in-ai)
- 2026-09-21 [Claude Opus 5.5 and GPT-6 Sol land, Claude finds a new enzyme](https://heyaliasif.com/ai/2026-09-21-week-in-ai)
- 2026-08-31 [Claude Fable 5.1 and GPT-6 Astra both land, plus Gemini 3.8 Flash](https://heyaliasif.com/ai/2026-08-31-week-in-ai)
- 2026-07-20 [Claude Opus 5 arrives, Gemini 3.6 Flash and Solar Open 2 follow](https://heyaliasif.com/ai/2026-07-20-week-in-ai)
- 2026-02-16 [Qwen3.5, Claude Sonnet 4.6 and Gemini 3.1 Pro in one week](https://heyaliasif.com/ai/2026-02-16-week-in-ai)
- 2026-02-02 [Claude Opus 4.6 and GPT-5.3-Codex land on the same day](https://heyaliasif.com/ai/2026-02-02-week-in-ai)
- 2026-01-12 [Anthropic's Cowork, DeepSeek's Engram and a new open image editor](https://heyaliasif.com/ai/2026-01-12-week-in-ai)
- 2025-10-13 [Claude Haiku 4.5, Skills, Veo 3.1, and nanochat](https://heyaliasif.com/ai/2025-10-13-week-in-ai)
- 2025-09-29 [Claude Sonnet 4.5, Sora 2, and DeepSeek's sparse attention](https://heyaliasif.com/ai/2025-09-29-week-in-ai)
- 2025-09-08 [Claude makes files, Qwen3-Next goes sparse, ERNIE 4.5 Thinking](https://heyaliasif.com/ai/2025-09-08-week-in-ai)

Canonical: https://heyaliasif.com/ai/topics/claude