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Public story · 2026-07-19 · high
The leak was a research build called Honeycomb EAP, pulled from Cursor within hours, and Opus 4.8 remains the flagship at $5/$25 per million tokens.
Why now: Coverage as of July 19 is still circulating claims seeded by the July 9 Cursor sighting, with nothing new from Anthropic since.
Claude Opus 5 remains unannounced: no API model ID, no system card, and no confirmation from Anthropic, per ExplainX.
That matters for teams deciding whether to lock in Opus 4.8 pricing now or hold their budget for a release Anthropic hasn't scheduled. Planning around a picker sighting instead of a system card means betting against Anthropic's own silence on the matter.
Every 'launch is imminent' story traces back to one sighting. A research model labeled Honeycomb EAP appeared briefly in Cursor's model picker around July 9, then got pulled within hours. That's the whole basis for the rumor cycle.
Anthropic's flagship hasn't changed. Opus 4.8, released May 28, is still the model on the API, priced at $5/$25 per million tokens.
A model yanked from an editor's picker within hours looks more like a mistake than a soft launch. Anyone promising Opus 5 specs or a ship date off that sighting is speculating past what ExplainX actually reported.
Coverage as of July 19 is still circulating claims seeded by the July 9 Cursor sighting, with nothing new from Anthropic since.
Each link below shares sources, entities, or timing with this story.
This is the agent-security story of the week, and it needs no code to work. Noma Security disclosed GitLost (CVE-2026-44246) on July 6. An unauthenticated attacker posts a crafted issue on a public org repo. The AI agent (Claude or Copilot) triggers on issues.assigned, reads t...
I've been saying for months that the real gains aren't in switching models. They're in how you set up the environment around the model. Now there's quantitative proof. Stanford IRIS Lab published Meta-Harness, a system that autonomously evolves its own coding harness, system p...
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43.3% on Frontier-Bench v0.1. Opus 4.8 scored 18.7%. That's not an incremental bump, that's the same benchmark with a different shape of answer. Anthropic released Claude Opus 5 on July 24 at $5/$25 per million input/output tokens, exactly half of Fable 5's $10/$50, while matc...
xAI launched Grok 4.5 and Grok Build on July 8, trained partly on Cursor developer-session data. The numbers are loud: 83.3% on Terminal-Bench 2.1, 64.7% on SWE-Bench Pro, priced at $2/$6 per million tokens. On a single coding task that works out to roughly $2.49 versus $11.80...
I don't care that Grok 4.5 ranks #4. I care that it resolves a SWE-Bench Pro task with an average of 15,954 output tokens where Opus 4.8 spends 67,020. That's a 4.2x efficiency gap, and it lands straight in my monthly bill. SpaceXAI launched Grok 4.5 on July 8, a roughly 1.5T-...
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