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CWork101 / models

Models

The Mythos, Fable, Opus, Sonnet and Haiku families, with model IDs, context and output limits, provider availability, and the retirement timeline.

15 entries in this section

Model matrix

Blank = not documented, not "unavailable"

ModelStatusBest forContextOutputIn / OutAPIBedrockVertexFoundry
Claude Fable 5claude-fable-5GALong-running agents, hardest tasks1M128K$10 / $50●●●●
Claude Mythos 5claude-mythos-5PreviewDefensive cybersecurity workflows1M128K$10 / $50●———
Claude Opus 5claude-opus-5GAComplex agentic coding, enterprise work1M128K$5 / $25●●●●
Claude Sonnet 5claude-sonnet-5GABalanced speed and intelligence1M128K$2 / $10●●●●
Claude Haiku 4.5claude-haiku-4-5-20251001GAHigh-volume, latency-sensitive work200K64K$1 / $5●●●●
Claude Opus 4.8claude-opus-4-8GALegacy workloads on Opus-tier capability1M128K$5 / $25●●●●
Claude Opus 4.7claude-opus-4-7GALegacy workloads pinned before Opus 4.81M128K$5 / $25●●●●
Claude Opus 4.6claude-opus-4-6GALegacy workloads on the older tokenizer1M128K$5 / $25●●●●
Claude Sonnet 4.6claude-sonnet-4-6GALegacy workloads pinned before Sonnet 51M128K$3 / $15●●●●
Claude Sonnet 4.5claude-sonnet-4-5-20250929GALegacy workloads pinned to the 4.5 generation200K64K$3 / $15●●●●
Claude Opus 4.5claude-opus-4-5-20251101GALegacy workloads pinned to the 4.5 generation200K64K$5 / $25●●●●

Model deprecations and retirements

Ongoing

Anthropic's model lifecycle — the four states a model moves through, the notice period, and the full record of what has been retired and what replaced it.

Model IDs and versioning

Ongoing

How Claude model identifiers work — why every ID is a pinned snapshot, why the dated format disappeared, and how the same model is named differently on each cloud.

Claude Fable 5

GA

Anthropic's most capable widely released model, aimed at long-running agents, with always-on adaptive thinking and the highest price of any generally available Claude model.

Claude Mythos 5

Preview

An invitation-only model sharing Claude Fable 5's specifications and pricing, offered for defensive cybersecurity work through Project Glasswing.

Claude Opus 5

GA

Anthropic's model for complex agentic coding and enterprise work, and the default recommendation when you are not sure which Claude model to pick.

Claude Sonnet 5

GA

The mid-tier Claude 5 model, positioned as the best balance of speed, intelligence and price, and the cheapest current model with a 1M-token context window.

Claude Haiku 4.5

GA

The fastest and cheapest current Claude model, and the only current model that still supports the explicit extended thinking parameter.

Claude Opus 4.8

GA

The previous Opus flagship, still active and identically priced to Opus 5, and the recommended replacement for several retired models.

Claude Opus 4.7

GA

A legacy Opus model, and the release that introduced the current tokenizer and removed the sampling parameters.

Claude Opus 4.6

GA

A legacy Opus model on the older tokenizer, and the one where fast mode silently does nothing rather than erroring.

Claude Sonnet 4.6

GA

The previous Sonnet flagship — still active, 50% more expensive than Sonnet 5, and the last Sonnet to use the pre-4.7 tokenizer.

Claude Sonnet 4.5

GA

A legacy Sonnet model with the nearest retirement date of any active model — September 2026 — and the last Sonnet without adaptive thinking.

Claude Opus 4.5

GA

A legacy Opus model with a November 2026 retirement date, still on the 200K context window and the explicit thinking parameter.

Claude Mythos Preview

Deprecated

The deprecated predecessor to Claude Mythos 5 — an invitation-only preview model that still went through a documented deprecation with a published migration guide.

Retired models

Ongoing

Every Claude model that no longer answers requests on the Claude API — with its retirement date, its replacement, and where it may still be reachable.

Full index

EntryTypeStatusLast verified
Claude Fable 5Anthropic's most capable widely released model, aimed at long-running agents, with always-on adaptive thinking and the highest price of any generally available Claude model.ModelGAAug 21, 2026
Claude Haiku 4.5The fastest and cheapest current Claude model, and the only current model that still supports the explicit extended thinking parameter.ModelGAAug 21, 2026
Claude Mythos 5An invitation-only model sharing Claude Fable 5's specifications and pricing, offered for defensive cybersecurity work through Project Glasswing.ModelPreviewAug 21, 2026
Claude Mythos PreviewThe deprecated predecessor to Claude Mythos 5 — an invitation-only preview model that still went through a documented deprecation with a published migration guide.ModelDeprecatedAug 21, 2026
Claude Opus 4.5A legacy Opus model with a November 2026 retirement date, still on the 200K context window and the explicit thinking parameter.ModelGAAug 21, 2026
Claude Opus 4.6A legacy Opus model on the older tokenizer, and the one where fast mode silently does nothing rather than erroring.ModelGAAug 21, 2026
Claude Opus 4.7A legacy Opus model, and the release that introduced the current tokenizer and removed the sampling parameters.ModelGAAug 21, 2026
Claude Opus 4.8The previous Opus flagship, still active and identically priced to Opus 5, and the recommended replacement for several retired models.ModelGAAug 21, 2026
Claude Opus 5Anthropic's model for complex agentic coding and enterprise work, and the default recommendation when you are not sure which Claude model to pick.ModelGAAug 21, 2026
Claude Sonnet 4.5A legacy Sonnet model with the nearest retirement date of any active model — September 2026 — and the last Sonnet without adaptive thinking.ModelGAAug 21, 2026
Claude Sonnet 4.6The previous Sonnet flagship — still active, 50% more expensive than Sonnet 5, and the last Sonnet to use the pre-4.7 tokenizer.ModelGAAug 21, 2026
Claude Sonnet 5The mid-tier Claude 5 model, positioned as the best balance of speed, intelligence and price, and the cheapest current model with a 1M-token context window.ModelGAAug 21, 2026
Model deprecations and retirementsAnthropic's model lifecycle — the four states a model moves through, the notice period, and the full record of what has been retired and what replaced it.ConceptOngoingAug 21, 2026
Model IDs and versioningHow Claude model identifiers work — why every ID is a pinned snapshot, why the dated format disappeared, and how the same model is named differently on each cloud.ConceptOngoingAug 21, 2026
Retired modelsEvery Claude model that no longer answers requests on the Claude API — with its retirement date, its replacement, and where it may still be reachable.ConceptOngoingAug 21, 2026

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