The Open-Source AI Stack
RSS
All models

Models · claude

Claude Opus 4.6

Proprietary Anthropic · 2026-02-05 · Proprietary

First Opus-class model with a 1M-token context window (in beta), released February 5 2026. Headline feature was agent teams in Claude Code, letting multiple agents work in parallel and coordinate autonomously. Long-context pricing premium kicks in above 200K input tokens ($10 / $37.50 per Mtok).

Cost

$5.00 / Mtok input
$25.00 / Mtok output

Anthropic API · as of 2026-05-21

source ↗

Speed

43.7 tok/sec output
1650 ms TTFT

· as of 2026-05-21

source ↗

Architecture

tokens in Embedding vocab not disclosed × N layers Architecture not disclosed (proprietary or undocumented) Output projection tokens out
Schema-generated from data/models.yaml. Every label is auditable against the model's sources.

Specs

Architecture
unknown
Total params
not disclosed
Active params
not disclosed
Context window
1.0M tokens
Attention
unknown
Position encoding
unknown
Post-training
rlhf, constitutional
OSI-approved
no
Data released
no
Training code
not released

Benchmarks

Each score carries the date it was published; we never infer or interpolate missing scores.

General reasoning

GPQA-Diamond 84.0 as of 2026-05-21 source ↗

Available quantizations

None. The weights are not distributed, so there are no public quantizations.

Notable innovations

  • · 1M context window (beta) for Opus-tier
  • · Agent teams in Claude Code (parallel agents with autonomous coordination)
  • · Adaptive thinking and context compaction

Lineage

First Opus with 1M context; agent teams feature in Claude Code.

Derived from

Claude Opus 4.5 2025-11-24

Derivatives

Sources