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ANTHROPIC · MODEL RELEASE TRACKER

Claude Opus 5.5

A sourced snapshot of the model release, pricing, availability and reported safeguards. Facts are dated and link to the underlying coverage.

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
Output-token priceper million output tokens
Published token pricingPublished prices cited: $4 per million input tokens and $20 per million output tokens (reported as lower than Opus 5: $5 input / $25 output), with reduced cache read costs.
CONTEXT WINDOW
Context window1,000,000 tokens
MODALITIES
Input modalitiesText, images
Output modalitiesText
BENCHMARKS
APEX Accounting benchmark resultReported as leading the APEX Accounting benchmark with 61.8% of grading criteria met (ahead of Fable 5.1 at 61.0%).
Company-reported benchmark comparisonsAnthropic claims Opus 5.5 matches or outpaces Fable 5.1 on many tasks and reports cost/performance advantages versus other models (examples cited: FrontierCode, Terminal-Bench 4.0, CursorBench; claims vs. GPT-6 Astra and GPT-5.6 Sol).
StarSkirmish (StarCraft) performanceClaude Opus 5.5 was essentially tied with OpenAI’s GPT-6 Astra as the best-performing AI-made bot in the StarSkirmish StarCraft competition, but both failed to top Stardust, the top-rated human-made bot.
AVAILABILITY
AvailabilityActive on Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS. Active (latest)

RELEASE TIMELINE

Published, source-backed release events only.

3 SOURCES · IMPORTANCE 9.0

Mistral launches public preview of Mistral Large 4 (ML4), a 1T-parameter open-weight multimodal model

Mistral has opened a public preview of Mistral Large 4 (ML4), a natively multimodal model with 1 trillion parameters and 49 billion active parameters; the preview API is available now and Mistral plans to publish the model weights by the end of the month. ML4 was trained on 3,800 NVIDIA Grace Blackwell GPUs in Mistral’s European datacenters, targets enterprise and cybersecurity workflows, and Mistral says it matches or exceeds other open-weight models on several benchmarks while enabling self-deployment and an EU-operated region.

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VERIFIABLE FACTS

Every value stays attached to a source and date.

PRICING · Published token pricingDEVELOPER CLAIM

Published prices cited: $4 per million input tokens and $20 per million output tokens (reported as lower than Opus 5: $5 input / $25 output), with reduced cache read costs.

BENCHMARKS · Company-reported benchmark comparisonsDEVELOPER CLAIM

Anthropic claims Opus 5.5 matches or outpaces Fable 5.1 on many tasks and reports cost/performance advantages versus other models (examples cited: FrontierCode, Terminal-Bench 4.0, CursorBench; claims vs. GPT-6 Astra and GPT-5.6 Sol).

WHAT CHANGED

Stored passport versions, without reconstructed history.

Passport updated20 facts
SAFETY · Cyber safeguards behavior+ Anthropic states that generally available models, including Claude Opus 5.5, have conservative cyber safeguards that block most cyber work.
SAFETY · FedRAMP Class D certification on Amazon Bedrock− Claude Opus 5.5 is reported to hold FedRAMP Class D certification on Amazon Bedrock (the post advises verifying current model certification status).
CAPABILITIES · Relative capability+ Anthropic lists Claude Opus 5.5 among its 'most capable models.'
Passport updated19 facts
SAFETY · Cybersecurity safeguards− Independent coverage reports stricter safeguards for cybersecurity use
SAFETY · FedRAMP Class D certification on Amazon Bedrock+ Claude Opus 5.5 is reported to hold FedRAMP Class D certification on Amazon Bedrock (the post advises verifying current model certification status).
CAPABILITIES · Intended use for regulated/compliance workloads+ The availability of Claude Opus 5.5 in AWS GovCloud (US) is presented as an on-ramp for AI-assisted development for workloads with regulatory or compliance requirements, including ITAR.
Passport updated18 facts
BENCHMARKS · StarSkirmish (StarCraft) performance+ Claude Opus 5.5 was essentially tied with OpenAI’s GPT-6 Astra as the best-performing AI-made bot in the StarSkirmish StarCraft competition, but both failed to top Stardust, the top-rated human-made bot.
Passport updated17 facts
RELEASE · Announcement / release date+ Announced and published by Anthropic and partners on 2026-09-22.
BENCHMARKS · APEX Accounting benchmark result+ Reported as leading the APEX Accounting benchmark with 61.8% of grading criteria met (ahead of Fable 5.1 at 61.0%).
BENCHMARKS · Company-reported benchmark comparisons+ Anthropic claims Opus 5.5 matches or outpaces Fable 5.1 on many tasks and reports cost/performance advantages versus other models (examples cited: FrontierCode, Terminal-Bench 4.0, CursorBench; claims vs. GPT-6 Astra and GPT-5.6 Sol).
CAPABILITIES · Efficiency compared to Opus 5+ Anthropic says Opus 5.5 does more with fewer tokens than Opus 5 and produces an average lower cost per task; also described as faster to run.
RELEASE · First model in the Opus 5.5 family+ Described as the first model of the Claude 5.5 model family.
RELEASE · Release date− September 22, 2026
CAPABILITIES · Intended suitability / primary use-cases+ Described as suitable for agentic coding, knowledge work, and long-running tasks, with improved clarity about what it did, found, and needs during long tasks.
PRICING · Published token pricing+ Published prices cited: $4 per million input tokens and $20 per million output tokens (reported as lower than Opus 5: $5 input / $25 output), with reduced cache read costs.
Passport updated11 facts
AVAILABILITY · Amazon Bedrock availability− Available on Amazon Bedrock
AVAILABILITY · Availability+ Active on Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS. Active (latest)
CONTEXT WINDOW · Context window+ 1,000,000 tokens
SAFETY · Cybersecurity safeguardsIndependent coverage reports stricter safeguards for cybersecurity use→Independent coverage reports stricter safeguards for cybersecurity use
MODALITIES · Input modalities+ Text, images
CAPABILITIES · Maximum output+ 128K tokens
MODALITIES · Output modalities+ Text
PRICING · Output-token priceper million output tokens→per million output tokens
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
RELEASE · Release dateMeasurement units or comparison conditions updated
Passport created4 facts