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Aug 28, 2026 · Catalog foundation is up

Product feature · runtime

Concurrent subagentsCommon product term

Run multiple child-agent tasks concurrently with explicit queue and fan-out limits.

Terminology basis: Common product term. Anthropic — Run agents in parallel

Concurrent subagents: 7 supported, 0 partial, 0 unsupported, 24 unreviewed across 31 cataloged products.

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Explore this familyMore in Subagents9 capabilities

Current evidence by product

Can my agent use Concurrent subagents?

Read across for the answer. 7 of 31 current product columns have reviewed evidence; unreviewed does not mean unsupported.

Known issues (0)Report an issue
  • Supported7
  • Partial0
  • Unsupported0
  • Unknown24
  • Not applicable0

Web

9 products

Desktop

13 products

CLI

9 products

Unknown means no public evidence has been reviewed for that product and capability. It does not mean unsupported.

How statuses are assigned

Definition and scope

What this capability means

This row requires two or more child-agent executions whose active intervals overlap. Sequential delegation, concurrent ordinary tool calls, and detached shell commands do not establish concurrent subagents.

Evidence should record maximum active and queued children, nesting effects, per-plan or per-organization quotas, scheduling order, cancellation behavior, rate-limit sharing, and whether concurrent children can safely write to the same workspace. Tests should detect accidental serialization as well as unsafe shared-state races.

Traceable compatibility

Assertion ledger

Documentation evidence only. No runtime conformance test is implied.

ChatGPTweb · current
Supported
Target
2026-08-28 ChatGPT Work web documentation observation · hosted-observation
Environment
hosted-default
Observed
2026-08-28
  • planavailable to eligible accounts; the reviewed page establishes parallel execution but does not publish a numeric web fan-out cap
Evidence
ChatGPTdesktop · current
Supported
Target
current ChatGPT desktop documentation · dated-documentation
Environment
local-default
Observed
2026-08-28
  • runtimelocal Codex supports parallel child threads; agents.max_concurrent_threads_per_session caps spawned threads and excludes the primary thread
Evidence
Codex CLIcli · current
Supported
Target
current Codex CLI documentation · dated-documentation
Environment
local-default
Observed
2026-08-28
  • runtimeagents.max_concurrent_threads_per_session caps spawned threads and excludes the primary; leaving it unset delegates the default to Codex
Evidence
Cursordesktop · current
Supported
Target
current Cursor subagent documentation · dated-documentation
Environment
local-default
Observed
2026-08-28
  • runtimemultiple Task calls can start simultaneously; shared-checkout writers can collide unless worktree or cloud isolation is requested
Evidence
Copilot CLIcli · current
Supported
Target
current GitHub Copilot CLI documentation · dated-documentation
Environment
local-default
Observed
2026-08-28
  • plandefault concurrent limits are 2 Free/Education, 4 Pro/Pro+, 8 Max, 16 Business, and 32 Enterprise; usage-based billing can configure up to 32
Evidence
Claude CLIcli · current
Supported
Target
current Claude Code parallel-agent documentation · dated-documentation
Environment
local-default
Observed
2026-08-28
  • runtimerunning several subagents at once multiplies token use and shares the account's rate limits
Evidence
Copilot Chatdesktop · current
Supported
Target
current VS Code subagent documentation · dated-documentation
Environment
local-default
Observed
2026-08-28
  • host-roleclaim is scoped to GitHub Copilot's local VS Code agent surface; published documentation does not state a fixed maximum parallel-child count
Evidence
  1. 1. Evidence checked 2026-08-28: Claude Code documents multiple foreground or background subagents, describes parallel subagent work, and exposes live subagents in the `/agents` panel and background work in `/tasks`.
  2. 2. Evidence checked 2026-08-28: ChatGPT Work and local Codex can run specialized agents in parallel; local Codex configuration exposes a maximum concurrent spawned-thread setting.
  3. 3. Evidence checked 2026-08-28: Cursor can send multiple Task calls in one parent turn so subagents run simultaneously; isolated worktrees or cloud environments are available for parallel writers.
  4. 4. Evidence checked 2026-08-28: GitHub Copilot CLI documents plan-based concurrent-subagent limits from 2 to 32 and a usage-billing override capped at 32.
  5. 5. Evidence checked 2026-08-28: VS Code explicitly documents spawning multiple subagents in parallel and provides examples that run several specialized reviewers concurrently.