Claude Opus 4 1 20250805: retirement, replacement and migration

Publisher-sourced inventory. Specifications come from official documentation and model cards. “Not documented” means we have no verified value. This inventory is separate from our editorial reviews.

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Current catalog answers

What to know about Claude Opus 4 1 20250805

AI-compiled from linked model documentation. This is a catalog reference, not an independent performance review. Catalog checked October 23, 2026.

What happened to Claude Opus 4 1 20250805, and what replaces it?

These details come from the linked publisher material for this model. Reported capabilities and training descriptions are publisher statements, not independent test results.

API retirement: Anthropic records retirement on 2026-08-05 for its operated platforms. Partner-operated Bedrock and Google deployments can use different schedules. Source
Recommended migration: The current lifecycle table names claude-opus-4-8 as the replacement. Requests to the retired model fail; test the replacement before migrating. Source

Which Claude Opus 4 1 20250805 does this page describe?

Claude Opus 4 1 20250805 is a model record from Anthropic in the Claude family. Source

The recorded model identifier or checkpoint is claude-opus-4-1-20250805. Use that exact identifier when checking documentation or a provider listing. Source

How can you access Claude Opus 4 1 20250805?

The catalog records the historical API access route for Claude Opus 4 1 20250805. Source

As of the catalog check, this version was marked retired. Source Check the linked lifecycle information before starting a new integration.

For a new integration, use the publisher’s replacement guidance and check its current account, region and endpoint requirements. Historical API access does not mean the retired endpoint can still be called.

Keep the exact version in view

Other Claude models from Anthropic.

These are separate records in the same publisher family. A shared family name does not establish equal capabilities or interchangeable licenses.

Claude 1.0

API

Claude 1.1

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Claude 1.2

API

Claude 1.3

API

Claude 2.0

API

Claude 2.1

API

The documented record

Specifications, with their sources.

A missing value remains unknown. Input limits, output limits and the total context window are separate measurements.

Publisher: AnthropicSource ↗
Family: ClaudeSource ↗
Version: claude-opus-4-1-20250805Source ↗
Availability: RetiredSource ↗
Access: APISource ↗
Inputs: Not documented
Outputs: Not documented
Context window: Not documented
Maximum input: Not documented
Maximum output: Not documented
Knowledge cutoff: Not documented
Training-data cutoff: Not documented
Training completed: Not documented
Release date: Not documented
License: Not documented
Input price / 1M tokens: Not documented
Output price / 1M tokens: Not documented

Read this with the numbers.

Historical API identity from Anthropic lifecycle documentation; availability applies to Anthropic-operated API. Historical specs unverified.

Model identifiers and aliases 0

No additional identifier has been verified.

Follow the evidence

Official sources.

model deprecations — official Anthropic documentation ↗platform.claude.com

From the Headless Thrones newsroom

Editorial about Claude Opus 4 1 20250805

No published articles are linked to this exact model yet. New coverage will appear here as it is published.

Your starting point

Claude Opus 4 1 20250805

Anthropic · API

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Inputs: Not documented
Outputs: Not documented
Context window: Not documented
Knowledge cutoff: Not documented

A place to begin comparing

0 models to consider.

Matches must share an access route, support every documented input type of your starting model, and return text. When both publish a context limit in the same field, the candidate must fall between half and twice that limit. Unknown or differently defined limits remain as broader matches, after verified near-context matches. Within each group, recent documented releases appear first. These criteria do not establish equal quality. The full current inventory is considered.

No candidate meets the documented access, input/output and context criteria. You can still choose models manually in the comparison tool.

A record you can follow

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Official sources

Model records cite the developer’s documentation, release notes and model cards. A listing alone is not a tested service or a recommendation.

Dates mean different things

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Limits need context

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Coverage and last check

Independent editorial model library assembled from primary vendor documentation and official publisher model cards. This is a dated, auditable inventory of the sources reviewed, not a claim to every model worldwide. First-party language-model inventory for OpenAI, Anthropic, Google Gemini/Gemma, xAI, Meta and Reflection. Includes vendor-listed legacy/retired identities with explicit statuses; official pretrained and instruction-tuned checkpoints remain distinct. Excludes embeddings, moderation/guard models, image/audio/video-only generation, community fine-tunes, speculative draft helpers, format/runtime/quantization duplicates, and PaliGemma dataset-specific benchmark fine-tunes. Availability means documented vendor API or downloadable official weights, not guaranteed account eligibility. Unknown specifications and dates remain null. Rounded K/M limits preserve vendor granularity; exact integers are used only where documented. No OpenRouter facts are used. Primary-source inventory of language-capable models from Alibaba/Qwen, DeepSeek, Moonshot, MiniMax, Z.ai, ByteDance Seed, Tencent, Baidu, Xiaomi, StepFun, 01.AI, Shanghai AI Laboratory, Baichuan and OpenBMB. Includes full reachable official public weight inventories plus documented hosted API models and explicit retirements. Embeddings, reward/classifier/router/tokenizer/draft-head components, standalone OCR/document converters and image/video/audio-only generators are excluded; multimodal language models retained. Official packaging variants are folded into aliases where a canonical listing was identifiable; remaining research/base/SFT variants retain exact identities. Not a guarantee every historical/private/regional model is available. Unknown specifications remain null; K/M API display quantities use decimal normalization where explicitly noted, rather than implying verified exact serving ceilings. Model-name dates and repository creation timestamps are never used as release/training dates. Open weights does not mean unrestricted or OSI-open-source licensing. Some model-card bodies were unreachable; their public inventory metadata is retained and disclosed. Official Mistral, Cohere, AI21, NVIDIA Nemotron, Microsoft Phi/MAI, Amazon Nova, IBM Granite, AllenAI OLMo/Molmo, TII Falcon, Nous Research, Arcee and Essential AI model inventory checked 2026-10-23. Includes base, instruction, reasoning, coding and text-producing multimodal models, including legacy API versions. Excludes embeddings/rerankers/reward and safety classifiers, image/audio/video-only generation, robotics-only models, duplicate quantization/runtime packages, adapters, intermediate checkpoint experiments, and third-party mirrors. Arcee coverage focuses on its named product families rather than exploratory merge repositories. Repository listing means listed, not independently verified API availability. K/M figures are nominal decimal normalizations when the source supplies shorthand; deployment-specific exact token limits may differ. Unverified values remain null. This is a source-backed inventory, not a complete claim-level independent editorial review. Supplemental official Liquid AI, Reka and Inception generative language catalog. Excludes media-only generators and decision/classification-only models. No assumed training dates.

Catalog edition updated Oct 23, 2026. Source links are provided on each model record.

View the full coverage report and discovery sources ↗