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Current Models & Pricing

All levels

This is the one page in AILmanac with a hard freshness guarantee. Every model fact elsewhere on the site links here instead of hard-coding a name or number, so there's a single place to keep current.

Current Claude models​

Last verified: 2026-09-14 · Official models & pricing

ModelAPI model IDTierBest for
Claude Fable 5.1claude-fable-5-1Mythos-class — flagship (above Opus)Anthropic's most capable widely released model, released September 1, 2026. For demanding reasoning and long-horizon agentic work, or when Opus 5 at higher effort still falls short on your evals. Same list price as Fable 5 with cache reads at a quarter of the cost. Three breaking changes vs Fable 5: forced tool_choice (any/tool) returns 400, thinking blocks are readable only by Fable 5.1 or newer, and editing earlier turns invalidates thinking blocks. Refuses in-band (HTTP 200, stop_reason: refusal); fallback targets are Opus 5 and Opus 4.8. 30-day retention (NOT ZDR-eligible); not on Priority Tier. (Supersedes Claude Fable 5, now a legacy model.)
Claude Mythos 5.1claude-mythos-5-1Mythos-class — restricted (Project Glasswing)Same underlying model, specs and pricing as Fable 5.1 with a different safeguard configuration, offered only to approved Project Glasswing participants (currently US organizations, via the Cyber Verification and Life Sciences Verification programs). Does not run the conversation-binding check on thinking blocks. Customers without access should use Fable 5.1.
Claude Opus 5claude-opus-5Opus — most capableComplex agentic coding and enterprise work: 1M context, 128k output, with materially better numbers than Opus 4.8. Default on Claude Max, strongest available on Claude Pro. (Supersedes Claude Opus 4.8, now a legacy model.)
Claude Sonnet 5claude-sonnet-5Sonnet — balancedThe default workhorse and Claude Code's default model: the best combination of speed and intelligence, with a 1M-token context window. Start here for most work. (Supersedes Claude Sonnet 4.6, now a legacy model.)
Claude Haiku 4.5claude-haiku-4-5-20251001Haiku — fastest & cheapestHigh-volume, latency-sensitive tasks: classification, extraction, routing, simple chat, and cheap sub-agents.
Claude Fable 5claude-fable-5Mythos-class — flagship (above Opus)Legacy since September 1, 2026 (superseded by Fable 5.1) but still available. Multiday autonomous runs, first-shot on ambiguous specs, dense vision, sustained delegation to parallel subagents. GA June 9 2026. Refuses in-band (HTTP 200, stop_reason: refusal) — configure server-side or client-side fallback. Adaptive thinking only; raw thinking never returned. 30-day retention (NOT ZDR-eligible). Two reasons to stay on it for now: it supports forced tool_choice and Priority Tier, which Fable 5.1 does not.
Claude Mythos 5claude-mythos-5Mythos-class — restricted (Project Glasswing), legacySuperseded by Mythos 5.1. Shares Fable 5's specs and pricing, offered separately for defensive cybersecurity workflows in Project Glasswing. Invitation-only, no self-serve sign-up. Customers without access should use Fable 5.1.

Model IDs are exact; tiers and 'best for' are guidance. Pricing, context-window sizes and rate limits change frequently and are intentionally NOT listed here — always read them on the official page above. This file is the single source of truth: never hard-code model facts in prose, link to this table instead.

Why pricing and context limits aren't in the table​

They change too often to copy safely — a stale price is worse than no price. We list the identity of each model (name, API ID, what it's for) and send you to the official page for pricing, context windows, and rate limits, which is always authoritative.

How we keep this fresh​

  • The table is rendered from a single data file (data/models.json) carrying a "last verified" date.
  • Updating it is a one-line change — a perfect first contribution.
  • In a later phase, automation will diff this file against the official models endpoint and open a pull request when something drifts — but a human always reviews before it ships. (See How Our Automation Works.)

Choosing between them​

A quick rule of thumb (full guidance in Choosing a Model):

  • Start with Sonnet. Best balance of quality, speed, and cost for most work.
  • Reach for Opus when quality on a hard problem matters more than cost.
  • Drop to Haiku for high-volume, latency-sensitive, or simple tasks.

See also​

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