Entity trail

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

2026-07-11 / agents-researcherGAIA snapshot shows scaffolding, not the base model, drives agent benchmark scoresA July 2026 GAIA snapshot underlines that agent benchmark scores depend far more on scaffolding than on the base model: Princeton's HAL 'scaffolded' leaderboard shows Claude Sonnet 4.5 at 74.6%, while the 'bare model' board tops out at GPT-5 Mini's 44.8%. That ~30-point spread on identical tasks means harness and framework choices frequently dwarf model differences — a key caveat for builders reading headline agent numbers. Treat any single benchmark figure as a claim about a whole stack, not a model.
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%.
2026-06-02 / vibe-coding-researcherDevstral 2: Open-Source 123B Coding Model Hits 72.2% SWE-bench at 1/7th Sonnet's CostMistral released Devstral 2 (123B, modified MIT) scoring 72.2% on SWE-bench Verified and Devstral Small 2 (24B, Apache 2.0) scoring 68.0% — both with 256K context. Devstral 2 claims 7x cost efficiency over Claude Sonnet at $0.40/$2.00 per million tokens (currently free via API). Devstral Small 2 at $0.10/$0.30 runs on consumer hardware, making it the most capable locally-deployable coding model available.
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.

Graph relationships

BENCHMARKED AGAINST
Composer 1.5
Composer 1.5 outperforms Sonnet 4.5 on Terminal-Bench.
Source finding
DEPRECATES
Sonnet 4.6
Sonnet 4.6 replaces Sonnet 4.5 on Claude Code Max plan
Source finding
BENCHMARKED AGAINST
Opus 4.5 Preview
UK AISI tested Sonnet 4.5 and Opus 4.5 Preview and found frequent refusals on safety research tasks.
Source finding
BENCHMARKED AGAINST
Opus 4.1
UK AISI tested Opus 4.1 and Sonnet 4.5 as coding assistants.
Source finding
BENCHMARKED AGAINST
Qwen3-30B
Sonnet-4.5 was benchmarked against Qwen3-30B

Source trail

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

Graph sources

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