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Claude Opus 5.5

Claude Opus 5.5 is a 2026 Opus-series model from Anthropic optimized for coding, knowledge work, and long-running tasks; it emphasizes efficiency, clearer communication, and stronger safety classifiers.

CURRENT SNAPSHOT5/5 DIMENSIONS WITH DATA

The dimensions that change the decision.

PRICING
Input price$4 USD / 1M input tokens; Claude API standard, global routing
Output price$20 USD / 1M output tokens; Claude API standard, global routing
Cached input price$0.2 USD / 1M cached input tokens; Claude API standard, global routing
Token pricing and operational cost claimsAnthropic and partners report lower per-token prices and higher efficiency: input tokens priced at $4 per million and output tokens at $20 per million (down from $5/$25 for Opus 5); cache read costs substantially reduced and total operating costs claimed to be about ~40% lower than Opus 5.
CONTEXT WINDOW
Context window1,000,000 tokens
MODALITIES
Input modalitiesText, images
Output modalitiesText
BENCHMARKS
Benchmark and cost-performance claimsAnthropic claims Opus 5.5 matches Claude Fable 5.1 on most tasks and outperforms or equals several competitors on coding and knowledge benchmarks at lower cost (citing FrontierCode, Terminal-Bench 4.0, CursorBench and comparisons to models such as GPT-6 Astra).
AVAILABILITY
Availability on AWS / Amazon BedrockClaude Opus 5.5 is available on Amazon Bedrock and the Claude Platform on AWS; it can be selected and tested via the Amazon Bedrock console (Playground) and called programmatically through Bedrock runtime APIs.

VERIFIABLE FACTS

Every value stays attached to a source and date.

AVAILABILITY · Availability on AWS / Amazon BedrockDEVELOPER CLAIM

Claude Opus 5.5 is available on Amazon Bedrock and the Claude Platform on AWS; it can be selected and tested via the Amazon Bedrock console (Playground) and called programmatically through Bedrock runtime APIs.

RELEASE · Announcement / release timingDEVELOPER CLAIM

Announced/released in late September 2026 (articles reporting availability and launch on September 22, 2026).

PRICING · Token pricing and operational cost claimsDEVELOPER CLAIM

Anthropic and partners report lower per-token prices and higher efficiency: input tokens priced at $4 per million and output tokens at $20 per million (down from $5/$25 for Opus 5); cache read costs substantially reduced and total operating costs claimed to be about ~40% lower than Opus 5.

BENCHMARKS · Benchmark and cost-performance claimsDEVELOPER CLAIM

Anthropic claims Opus 5.5 matches Claude Fable 5.1 on most tasks and outperforms or equals several competitors on coding and knowledge benchmarks at lower cost (citing FrontierCode, Terminal-Bench 4.0, CursorBench and comparisons to models such as GPT-6 Astra).

SAFETY · Safety classifiers and safeguardsDEVELOPER CLAIM

Opus 5.5 includes safety classifiers similar to Claude Fable 5.1 for biology, cybersecurity, and AI development; it will refuse flagged requests more frequently and (per Anthropic) will reroute certain cybersecurity queries to Opus 4.8 and some biology-related requests to Opus 5. The model was evaluated by outside partners (e.g., Frontier Design, METR) before release.

LIMITATIONS · Writing quality and 'Claudish' styleDEVELOPER CLAIM

Anthropic engineers and reports state that recent Claude models developed an AI-oriented writing style ('Claudish') optimized for model-to-model communication; Anthropic says Opus 5.5 achieves a better balance and improves human-readable explanations compared to immediate predecessors, though the issue remains an ongoing challenge.

WHAT CHANGED

Stored passport versions, without reconstructed history.

Passport updated14 facts
CONTEXT WINDOW · Context window+ 1,000,000 tokens
MODALITIES · Input modalities+ Text, images
CAPABILITIES · Maximum output+ 128K tokens
MODALITIES · Output modalities+ Text
PRICING · Cached input price+ $0.2 USD / 1M cached input tokens; Claude API standard, global routing
PRICING · Input price+ $4 USD / 1M input tokens; Claude API standard, global routing
PRICING · Output price+ $20 USD / 1M output tokens; Claude API standard, global routing
Passport created7 facts