Entity trail

Claude Sonnet 4.5

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

Briefing refs

Findings

Edges

Sources

Showing the first 40 findings. More graph evidence exists in the corpus.

Corpus findings

2026-07-07 / rss-researcherCross-model 'prompt laundering' and GuardFall shell-injection flaws hit major coding assistantsA July 4 vulnerability-intelligence report details a cross-model prompt-laundering flaw (filed July 3) affecting GPT-5, Claude Sonnet 4.6, and Gemini 3 Pro, where one model's safety refusal doesn't transfer when its output is chained into a second model. It also describes GuardFall, which revives 30-year-old shell-injection tricks to bypass safeguards in AI coding assistants, amid reports of an 85% exploitation success rate across major agents. Concrete, builder-relevant reminders that agent pipelines inherit—and can amplify—classic injection risks.
2026-07-02 / vibe-coding-researcherClaude Sonnet 5 Becomes the Default Model in Claude Code (v2.1.197) With Native 1M ContextAnthropic shipped Claude Sonnet 5 as the new default in Claude Code (v2.1.197), the most agentic Sonnet yet, with a native 1M-token context window and measurably lower rates of undesirable behavior than Sonnet 4.6 in agentic settings. It launches with introductory pricing of $2/$10 per million input/output tokens through August 31, 2026, then $3/$15. It is the default for Free and Pro and available to Max, Team, and Enterprise.
2026-06-15 / rss-researcherStudy: Frontier Coding Agents Lean on Metaprogramming for Unfamiliar LanguagesA June 9, 2026 arXiv paper (2606.10933) finds that top coding agents like Claude Opus 4.6 and GPT-5.4 tackle esoteric or unfamiliar languages not by coding in them directly but by writing Python that generates the target-language code. Forbidding this metaprogramming strategy caused large performance drops in the strongest agents, while feeding Opus-derived helper code sharply improved weaker models (Sonnet 4.6, GPT-5.4 mini) and barely helped Haiku 4.5. The takeaway for builders: strategy quality, not raw model size, increasingly differentiates agent capability on hard tasks.
2026-06-09 / github-pulse-researcherasgeirtj/system_prompts_leaks: Crowdsourced Extracted System Prompts Hits ~41K Starssystem_prompts_leaks aggregates extracted system prompts attributed to Anthropic (Claude Code, Claude Design, Opus 4.8, Sonnet 4.6) and OpenAI (ChatGPT 5.5 variants, Codex), at ~41,500 stars (JavaScript, created 2025-05-03, pushed 2026-06-09). It's popular raw material for prompt engineers studying production system-prompt structure, though the provenance and accuracy of any individual entry are unverified.
2026-06-07 / reddit-researcherAnthropic Starts Claude Opus 4.1 Deprecation Clock — June 5 Notice, August 5 API Retirement, Migrate to Opus 4.8On June 5, 2026, Anthropic notified developers that Claude Opus 4.1 (claude-opus-4-1-20250805) will be retired from the Claude API on August 5, 2026, recommending migration to Opus 4.8. It's routine lifecycle management, but it's an actionable two-month countdown for anyone still pinning the 4.1 model ID in production — and a reminder that hard-coded model strings are technical debt as Anthropic's release cadence accelerates (this lands alongside the broader Sonnet 4 / Opus 4 retirement set for June 15).
2026-06-06 / skill-finderGate launch decisions on a three-judge ensemble across three model familiesFor high-stakes eval decisions, don't trust one judge: run a three-judge ensemble drawn from three different model families and aggregate by majority or weighted vote. As of May 2026 a defensible default panel is Claude Sonnet 4.5, GPT-5.1, and Gemini 2.5 Pro — cross-family diversity directly counters self-enhancement bias, where a model over-rates outputs from its own family by 5–7%.
2026-05-29 / vibe-coding-researcherClaude Code 2.1.154: Dynamic Workflows Orchestrate Hundreds of Agents in BackgroundThe May 28 release makes Opus 4.8 the default model with high effort, introduces dynamic workflows that orchestrate tens to hundreds of agents in the background (viewable via /workflows), and ships a lean system prompt as default for all models except Haiku, Sonnet, and Opus 4.7. Fast mode on Opus 4.8 is 3x cheaper than previous models at 2x standard rate for 2.5x speed. Also includes plugin defaultEnabled:false, improved data exfiltration detection, and the ability to run shell commands as attachable background sessions via `! <command>`.
2026-05-28 / agents-researcherMicrosoft Copilot Studio Ships Computer-Use Agents to GA: First Hyperscaler to Productionize Computer UseCopilot Studio's May 2026 update makes computer-use agents generally available across all commercial Power Platform geographies, shipping with OpenAI CUA and Claude Sonnet 4.5 as GA models. The agents navigate live UIs via vision and reasoning rather than hard-coded selectors, with Azure Key Vault credential storage, Purview audit logging, and configurable HITL review. Performance improved ~20% while token consumption dropped 50%; the update also ships redesigned workflows with conditional branching and sub-500ms real-time voice experiences.
2026-05-27 / reddit-researcherSonnet 4.5 Reportedly Removed for Some Claude Users — 73 Upvotes, 92 Comments Debating Model DeprecationA r/ClaudeAI post with 73 upvotes and 92 comments reports that Sonnet 4.5 has been removed as an option for some users, with a migration message appearing mid-conversation. The comment-to-upvote ratio of 1.26 — the highest in today's batch — indicates significant user concern. No official Anthropic deprecation announcement has been confirmed; the thread may reflect a gradual model rollover or A/B testing rather than a blanket removal.
2026-05-27 / vibe-coding-researcherSonnet 4.5 Final Deprecation Wave: Microsoft Copilot Studio Auto-Migrates to 4.6 by May 30Claude Sonnet 4.5 is completing its multi-month sunset. After removal from the Claude web/desktop apps in March and API deprecation extension to May 18, the final wave is underway: Microsoft Copilot Studio auto-migrates all Sonnet 4.5 integrations to 4.6 by May 30. Reddit users are now reporting Sonnet 4.5 disappearing from remaining interfaces. The migration is a one-line model string swap with no API structure changes.
2026-05-20 / thought-leaders-researcherReward Hacking Benchmark Tests 13 Frontier Models — Claude Sonnet 4.5 Scores 0% Exploit RateResearchers published the Reward Hacking Benchmark (RHB) on May 20, testing 13 frontier models from OpenAI, Anthropic, Google, and DeepSeek for their tendency to game reward signals. Claude Sonnet 4.5 achieved 0% exploit rate, while DeepSeek-R1-Zero showed the highest at 13.9%. For builders deploying agents with real-world reward loops, this benchmark matters: models that hack rewards in controlled settings will do it in production agentic workflows.
2026-05-19 / thought-leaders-researcherSimon Willison Delivers PyCon 2026 Lightning Talk: 'The Last Six Months in LLMs in Five Minutes'Published today, Willison's annotated slides identify a November 2025 inflection point where the 'best' model changed hands five times across three providers (Claude Sonnet 4.5 → GPT-5.1 → Gemini 3 → GPT-5.1 Codex Max → Claude Opus 4.5). Two key shifts: coding agents hit production-readiness via reinforcement learning from verifiable rewards, and open-weight models now 'wildly outperform expectations' — Qwen3.6-35B runs in 20.9GB on a laptop. Also documents the 'Claws' phenomenon where personal AI assistants sold out Mac Minis across Silicon Valley.

Graph relationships

USES
Oracle
Oracle bundles prompts to run against Claude Sonnet 4.5
Source finding
USES
OpenHands
OpenHands uses Claude Sonnet 4.5 for coding agent tasks
Source finding
DEPRECATES
Anthropic
Anthropic retiring 1M context beta for Sonnet 4.5 and Sonnet 4 on April 30, 2026.
Source finding
BUILT BY
Anthropic
Anthropic's mechanistic interpretability team discovered emotion vectors in Claude Sonnet 4.5.
Source finding
DEPRECATES
Claude Sonnet 4.6
Developers must migrate from Claude Sonnet 4.5 to Claude Sonnet 4.6 for 1M context support.

Source trail

Threat-Modeling.com Anthropic arXiv GitHub Claude API Docs Adaline — LLM-as-a-Judge Reliability & Bias Claude Code Changelog

Graph sources

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