# OpenAI and Anthropic reportedly abandoned mutual safety testing deal

Digest AI · Policy & Regulation · published 2026-09-24T05:30:00Z

Canonical: https://digestai.news/story/openai-and-anthropic-reportedly-abandoned-mutual-safety-testing-deal

## Summary

OpenAI and Anthropic reportedly reached the formal contracting stage for an agreement to conduct mutual safety tests on each other's models, but the deal was subsequently abandoned for unknown reasons. This information comes from reporting summarized on The AI Daily Brief. The collapse of this voluntary safety pact highlights the structural difficulties frontier labs face in cooperating on safety without regulatory pressure.

The article argues that voluntary cross-testing is inherently unstable because it requires one lab to give a rival privileged access to probe its model. This involves disclosing capabilities, guardrails, and failure modes, which are typically protected by trade secret law. While the safety benefits are diffuse, the commercial cost of revealing where a model breaks is immediate. Consequently, the arrangement is unlikely to remain voluntary without external mandates.

Microsoft, which holds a roughly 27% stake in OpenAI valued at about $135 billion and booked a $3.2 billion gain on its Anthropic investment in fiscal Q4 2026, faces governance and liability risks. If regulators mandate external AI model validation, Microsoft’s position with Azure’s $100 billion revenue and 30 million Copilot seats could allow it to profit most, but the current lack of agreement shifts risk onto its balance sheet.

## Key points

- OpenAI and Anthropic reportedly abandoned a mutual safety testing deal at the contracting stage for unknown reasons.
- Microsoft holds a roughly 27% stake in OpenAI valued at about $135 billion and booked a $3.2 billion Anthropic gain.
- Voluntary cross-testing is structurally unstable due to trade secret risks and the asymmetry between commercial cost and safety benefit.

## Why it matters

The collapse of this voluntary safety pact underscores the need for regulatory mandates to ensure frontier AI safety, as commercial incentives and trade secret protections make voluntary cooperation between rival labs unsustainable.

## Sources

1. [OpenAI and Anthropic Almost Agreed to Test Each Other’s AI. Then the Deal Quietly Died.](https://finance.yahoo.com/technology/ai/articles/openai-anthropic-almost-agreed-test-150828843.html) (finance.yahoo.com, 2026-09-24)

## Cite

Digest AI, "OpenAI and Anthropic reportedly abandoned mutual safety testing deal", 24 September 2026, https://digestai.news/story/openai-and-anthropic-reportedly-abandoned-mutual-safety-testing-deal

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