Sep 29, 2026·medium
Claude Team starts at two members; Enterprise billing and API catalog are refreshed.
September 29 check: Team starts at two members; Enterprise is $20/seat/month billed annually plus API usage. Current Opus 5.5 API pricing is $4/$20 per million input/output tokens, and Sonnet 5.5 is $2/$10. Shared Team controls apply to both seat types.
Small teams can now compare a two-member Team subscription. Enterprise budgets need annual seat commitments plus model usage; migrate model IDs and test workload quality before applying Opus 5.5's $4/$20 rate. Final model and rollout selection needs editorial review.
Open tool change historySep 4, 2026·high
Claude's current frontier ladder moves to Fable 5.1 and Opus 5.
Anthropic's current catalog lists Fable 5.1, Opus 5, Sonnet 5, and Haiku 4.5. Fable 5.1 is positioned as the highest-capability generally available model, while model guidance recommends Opus 5 as the starting point for most workloads. No official Opus 5.1 model is listed.
Update model allowlists and evaluation matrices to the official IDs. Use Fable 5.1 for the most demanding long-horizon work and benchmark Opus 5 as the lower-cost starting point instead of carrying forward Opus 4.8 or an invented Opus 5.1 label.
Open tool change historySep 4, 2026·medium
Claude Sonnet 5 keeps its $2/$10 API price as the standard rate.
Anthropic cancelled the previously scheduled September increase from $2/$10 to $3/$15 per million input/output tokens.
Remove the planned price step-up from forecasts. Sonnet 5 remains a materially cheaper production tier than Opus 5 and Fable 5.1 for workloads that pass quality evaluation.
Open tool change historyAug 14, 2026·high
Claude Cowork expands Claude into a scoped desktop outcome agent for paid plans.
Cowork performs multi-step work across local files and apps from the Claude desktop app. Anthropic describes containment around the user-selected workspace and a VM, while mount modes and approved tools or connectors determine the practical access boundary. It is available on paid plans, but consequential output still requires human review.
Treat the selected workspace, mount policy, and enabled connector or MCP set as the governance unit—not only the Claude seat. Pilot on approved folders with a review gate, separate usage or spend cap, and a clear escalation path for consequential actions.
Open tool change historyJul 11, 2026·medium
Claude Sonnet 5 launch pricing is $2/$10 per MTok through August 31.
Anthropic's Sonnet 5 announcement confirms a temporary API price of $2 input and $10 output per million tokens through August 31, 2026, before standard pricing moves to $3/$15.
API-heavy agent teams have a time-limited reason to benchmark Sonnet 5 now: its launch rate undercuts GPT-5.6 Sol and Claude Opus while approaching higher-tier agentic performance. Budgets must still model the September price step-up.
Open tool change historyJul 5, 2026·medium
Claude model cards now use Fable 5, Opus 4.8, Sonnet 5, and Haiku 4.5.
Anthropic's current model overview lists Fable 5, Opus 4.8, Sonnet 5, and Haiku 4.5 with updated context, output, and API pricing signals.
Teams comparing Claude as an agent-stack model should stop using the old 4.6 labels. Fable is now the highest-capability Claude option, Opus remains the complex coding and enterprise-work choice, Sonnet is the balance point, and Haiku is the scaled low-cost option.
Open tool change history