Claude Opus 5.5 (High, Default Fallback)

Benchmark scores, pricing, speed and comparisons for Claude Opus 5.5 (High, Default Fallback).

Claude Opus 5.5 (High, Default Fallback) is an AI model from Anthropic, released 2026-09-22. It scores 51.8 on the Intelligence Index.

Claude Opus 5.5 (High, Default Fallback) at a glance

Anthropic released Claude Opus 5.5 (High, Default Fallback) on September 22, 2026.

Claude Opus 5.5 (High, Default Fallback) scores 51.8 on the Intelligence Index, the overall score the AI Benchmark rankings sort models by. This score comes from independent third-party model evaluations, which Franklin AI syncs automatically each day.

It costs $4.00 per million input tokens and $20.00 per million output tokens, so a sample workload of 1 million input tokens and 200,000 output tokens costs about $8.00. It writes about 75 output tokens per second, so a 500-token answer takes roughly 6.7 seconds once output starts, after a wait of about 33.85 seconds for the first token.

The benchmark data has no Coding Index, Math Index or individual benchmark results for Claude Opus 5.5 (High, Default Fallback) yet.

Every pair of models in the catalogue has a head-to-head page. Pick Claude Opus 5.5 (High, Default Fallback) and a rival on the model comparisons page to compare their scores, prices and speed side by side.

Key scores

Intelligence51.8Index score
Speed74.7Tokens/sec

Comparisons with Claude Opus 5.5 (High, Default Fallback)

Side-by-side pages comparing Claude Opus 5.5 (High, Default Fallback) with other models.

Claude Opus 5.5High, Default FallbackAnthropicClaude Opus 5.5AnthropicThis comparison evaluates the two performance tiers of Anthropic’s Claude Opus 5.5. While both models share identical pricing structures, they diverge significantly in their intelligence benchmarks and operational latencFull breakdown Claude Opus 5.5High, Default FallbackAnthropicClaude Fable 5.1AnthropicThis analysis compares Anthropic’s Claude Opus 5.5 and Claude Fable 5.1, evaluating their performance, cost-efficiency, and benchmark capabilities to help users determine which model best suits their specific operationalFull breakdown Claude Opus 5.5High, Default FallbackAnthropicGPT-6 AstraOpenAIThis analysis compares Anthropic’s Claude Opus 5.5 and OpenAI’s GPT-6 Astra, evaluating their performance metrics, operational costs, and technical benchmarks to help users determine the optimal model for their specificFull breakdown