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Claude Opus 5.5 Enters Internal Testing, Leaps Two Tiers to Challenge GPT-6 at a Fraction of the Cost

Claude Opus 5.5 Enters Internal Testing, Leaps Two Tiers to Challenge GPT-6 at a Fraction of the Cost

October 25, 2026
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Claude Opus 5.5 Enters Internal Testing, Leaps Two Tiers to Challenge GPT-6 at a Fraction of the Cost

While anticipation for Opus 5.2 remains high, recent developments indicate a strategic leap to version 5.5. Early today, developer Lyra shared insider information revealing that Claude Opus 5.5, internally codenamed "claude-wafer-eap," is currently undergoing confidential testing. Rumors suggest an imminent, surprise launch could occur as early as Tuesday.

Pricing Structure: Input at $4, Output at $20

Opus 5.5 appears strategically positioned to compete directly with GPT-6. A leaked pricing structure reveals a significant cost advantage: $4 per million input tokens and $20 per million output tokens. This represents approximately a 20% reduction compared to the current Opus 5 rates of $5 and $25, respectively.

The primary driver behind these savings is a heavily optimized caching mechanism. Cache read costs have plummeted to $0.2 per million tokens, with write operations priced at $5. This low read cost drastically reduces expenses for enterprises developing long-context autonomous agents, effectively transforming premium models from luxury goods into essential utilities.

The release trajectory is equally notable. Following the July 24th launch of Opus 5 and a brief checkpoint for 5.2, the jump to 5.5 signals accelerated development. Internal tester Harshith described Opus 5.5 as a substantial improvement over previous iterations like Fable 5.1 and Astra, noting it generated a detailed 3D model of a Waymo vehicle—including the Jaguar logo and lidar sensors—at half the cost of its predecessor. Another developer successfully built a web-based 3D car viewer using Three.js and a "Walle robot" interface, demonstrating robust UI layout and mechanical integration.

Fable is also receiving notable updates. Developer Pankaj Kumar previewed Fable 5.2, suggesting a quiet transition from version 5.1. He rated its 3D generation capabilities as matching or exceeding Astra, capable of producing a "cliffside villa" with accurate lighting, material reflections, and atmospheric depth without detailed prompts. Furthermore, it can generate complete games using Three.js. In another test, a developer created a "mini world" using only native JavaScript, featuring dozens of high-end modeling elements, facial micro-expressions, dynamic effects, and interaction logic, all running smoothly.

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