Claude Fable 5 has emerged as the most expensive AI model ever benchmarked, with costs reaching approximately $6,228 to run the Artificial Analysis Intelligence Index. This cost is significantly higher than its competitors; for example, Claude Opus 4.8 and GPT-5.5 cost $3,700 and $2,900, respectively. The pricing reflects Anthropic’s strategy of refining its Claude model lineup under multiple tiers, designed to compete with OpenAI’s offerings while also accounting for real-world factors like token caching and fallback routing in its benchmarking methodology. The new pricing model for Claude Fable 5 doubles the flagship’s pricing across all token types, indicating a strategic shift for Anthropic in the competitive AI market.

GPT-5.5: GPT-5.5 is OpenAI’s advanced language model from its GPT family. It acts as a key competitive reference point in evaluations of intelligence and operational costs. The news compares Fable 5 directly against it on the Intelligence Index and pricing metrics.
GPT-5.5 Pro: GPT-5.5 Pro is a premium special tier variant of OpenAI’s GPT-5.5 model. It features the highest list pricing among models referenced in 2026 releases. The news cites it as the sole model exceeding Fable 5’s token rates.
Claude 3 Opus: Claude 3 Opus is an earlier flagship model in Anthropic’s Claude series. Its pricing history provides context for the evolution of Anthropic’s tiered offerings through subsequent Opus versions. The news traces how flagship rates changed from that baseline to the current Fable 5 structure.
Claude Fable 5: Claude Fable 5 is Anthropic’s newest flagship AI model, positioned at the top of the company’s Claude lineup. It builds on prior Opus iterations with advancements aimed at complex tasks such as agentic coding. The news centers on its benchmark results and elevated pricing structure relative to earlier Claude releases.
Claude Opus 4.8: Claude Opus 4.8 is a prior flagship model from Anthropic’s Claude series. It serves as the immediate predecessor benchmark for intelligence and cost comparisons. The news uses it to illustrate Fable 5’s gains and increased expenses across input, output, and cache token types.

`json
{
“AI Model Competition”: “Anthropic and OpenAI are actively engaged in releasing flagship AI models that compete on intelligence benchmarks, with ongoing adjustments to their pricing tiers reflecting the competitive landscape.”,
“Benchmarking Methodology”: “Evaluations of AI models have started to incorporate real-world elements like token caching and fallback routing, ensuring that these assessments better represent actual usage costs.”,
“Pricing Structure Evolution”: “Anthropic’s Claude model lineup reflects a strategic refinement in its pricing tiers, ranging from entry-level to premium flagship options, showcasing historical adjustments in response to market dynamics.”
}
`