Is Claude Code Down?

Quickest ways to check the current status of docs.anthropic.com plus recent known issues and working alternatives if it's out.

Last editorial review: 2026-09-05

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Known issues we've tracked

FABLE 5.1 IS THE NEW TOP MODEL IN CLAUDE CODE, AND IT DEFAULTS TO HIGH EFFORT HERE SPECIFICALLY (2026-09-01, vendor-primary): Anthropic shipped **Claude Fable 5.1**, and the detail that matters most for Claude Code users sits in a parenthetical on the launch post: '**Fable 5.1 defaults to High effort in Claude Code, and to Medium in Claude Cowork and on Claude.ai.**' **Claude Code is the only surface that defaults to High.** That is a defensible choice for a terminal agent doing long-running work, but it means the same prompt costs more here than in Cowork or on the web, and Anthropic's own framing is that '**when set to Low or Medium effort, Fable 5.1 achieves results similar to or better than Fable 5's at a much lower cost**' -- so the cheapest correct configuration for routine work is explicitly not the default you are given. **THE COST STORY IS CACHE-SHAPED, WHICH SUITS THIS TOOL UNUSUALLY WELL.** Fable 5.1's base rate is unchanged from Fable 5 at **$10/MTok input and $50/MTok output**; the entire quoted 25% saving (up to approximately 45% on 'highly agentic work') comes from **cache reads falling from $1/MTok to $0.25/MTok**. Claude Code re-reads a large, stable repo context on nearly every turn, which is close to the best possible case for a cache-read discount -- so of all the Anthropic surfaces, this is the one where the upper end of that range is plausible rather than promotional. **CODING EVIDENCE, VENDOR-PUBLISHED:** Terminal-Bench 4.0 **55.8%** (vs 42.0% for Fable 5, 52.3% for Opus 5, 37.3% for GPT-5.6 Sol); CursorBench 3.2.0 **73.4%** vs 70.5%; Terminal-Bench-Science 0.1 **52.6%** vs 24.7%. Anthropic says Fable 5.1 'avoids shortcuts that result in poorer-quality work' and fixes root causes, and cites Millennium finding a one-in-a-million crash that had gone unexplained for four to five years and that Fable 5 had missed. **Note the caveat Anthropic itself publishes: these runs had production safeguards enabled, and tasks where safeguards intervened scored zero**, which Anthropic says likely understates the numbers. Red Hat, quoted in the launch post, says Fable 5.1 'correctly identified the root cause of every broken build we tested, across all the effort levels' using Claude Code.
2026-09-01•Anthropic (anthropic.com/claude-fable-and-mythos-5-1 -- root path, not /news/) + platform.claude.com/docs/en/about-claude/pricing.md -- fetched 2026-09-05 via curl with browser UA
CLAUDE CODE PROMPTS CAN NOW BE GATED BY YOUR OWN SECURITY SERVER -- INFERENCE HOOKS BETA (2026-08-05, vendor-primary, Enterprise only): Anthropic shipped **inference hooks** in beta for **Claude Enterprise organizations**, and Claude Code is explicitly in scope. Point Claude at your organization's AI security server and '**each governed prompt across claude.ai, Cowork, and Claude Code is held for the server's allow or deny verdict before inference proceeds**' -- a synchronous pre-inference block, not retrospective logging. Requests to your server are **signed**, **failure handling is configurable**, and **denials land in the compliance Activity Feed**. **WHY THIS MATTERS SPECIFICALLY FOR CLAUDE CODE:** it is the surface where a coding agent sees source, secrets and infrastructure, and until now enterprise controls mostly stopped at API-level logging and data-retention terms. This is the first Anthropic control that can refuse a Claude Code prompt before the model ever sees it. **THE SETTING THAT DECIDES IF THIS IS SAFE TO TURN ON is the configurable failure handling** -- fail-closed makes your security server a hard dependency for every developer's Claude Code session, fail-open makes the control advisory. Decide that deliberately before rollout. Beta, Enterprise-tier only, and it requires you to actually run the security server
2026-08-05•Anthropic Claude Platform release notes (platform.claude.com/docs/en/release-notes/api, August 5 2026 entry, fetched 2026-08-06)
MCP SPEC 2026-07-28 IS OUT AND IT IS A BREAKING RELEASE (2026-07-28, spec-primary): the Model Context Protocol shipped its `2026-07-28` revision as a **stable release**, and it materially changes how MCP servers are built and operated. The headline, verbatim: '**The highlight of this release is a stateless protocol core - MCP is transforming from a bidirectional stateful protocol into a request/response stateless protocol.**' Practical consequence: '**Any request can now land on any server instance behind a plain round-robin load balancer without needing shared storage**' -- MCP servers become ordinary horizontally-scalable web services. Other changes: **Multi Round-Trip Requests (MRTR)** replace server-initiated streams so mid-call confirmations no longer need an open bidirectional connection; **header-based routing** moves method and tool names into the `Mcp-Method` and `Mcp-Name` HTTP headers so gateways can route and authorize without parsing JSON bodies; **authorization hardening** adds RFC 9207 issuer validation and moves from Dynamic Client Registration to Client ID Metadata Documents (CIMD); and **Tasks and MCP Apps graduate out of experimental** into a formal extensions framework. BREAKING BITS: the `initialize`/`initialized` handshake and session IDs are removed, and the 12-month deprecation policy now starts the clock on Roots, Sampling and Logging. '**The TypeScript, Python, Go, and C# SDKs are updated to match, with detailed migration notes for the breaking bits.**' Anthropic is rolling support across the Claude apps, Claude Code and the Platform API. If you maintain an MCP server for Claude Code, this is the upgrade to plan for
2026-07-28•MCP blog (blog.modelcontextprotocol.io/posts/2026-07-28/, fetched 2026-08-03), MCP spec (modelcontextprotocol.io/specification/2026-07-28)
ALIBABA WORKPLACE BAN NOW IN EFFECT (took effect 2026-07-10 per the announced schedule -- scope and date unchanged in all reporting through 7/10, no delay reported, no formal Anthropic statement): Alibaba banned Claude Code company-wide over an alleged 'backdoor' -- since v2.1.91 (April 2) Claude Code reportedly checked for Asia/Shanghai and Asia/Urumqi timezones plus a 147-entry list of Chinese proxy/cloud/AI-lab URLs, inserting markers into prompts; Claude Code is now on Alibaba's 'high-risk software' list. Anthropic's only response remains a Claude Code engineer's statement that it was an anti-distillation / reseller-abuse experiment from March, rolled back as of July 1. Alibaba employees are directed to the in-house Qoder tool. Background: Anthropic's June 10 letter accused Qwen operators of ~25,000 fraudulent accounts and 28.8M distillation conversations. Relevant if you operate in China-adjacent environments or are sensitive to telemetry behavior in CLI tools
2026-07-10•Reuters (2026-07-03), CNBC (2026-07-06), SCMP, The Decoder
MODEL UPDATE (2026-06-30): **Claude Sonnet 5** is now available in Claude Code (and is the new default on Free/Pro). Anthropic bills it as 'the most agentic Sonnet yet,' approaching Opus 4.8 quality at lower cost -- a meaningful default upgrade for everyday coding sessions, at $2/$10 per 1M. **PRICING UPDATE (confirmed 2026-08-31 on Anthropic's pricing doc): the $2/$10 rate was announced as introductory pricing through Aug 31 with a rise to $3/$15 on Sept 1 -- that increase was cancelled and $2/$10 is now the standard price.** For a Claude Code user this is the single biggest cost fact on the page, because Sonnet 5 is the default model on Free and Pro: the per-token cost of your default coding model is now permanently a third lower than the launch announcement scheduled, and Sonnet 5 permanently undercuts Sonnet 4.6 and 4.5, which both stay at $3/$15. Opus 4.8 remains the top-end option on Max for the hardest agentic work; the `xhigh` effort level is still the recommendation for coding. Note the new Sonnet-5 tokenizer inflates input token counts ~1.0-1.35x, so watch session cost on large repos. Separately, after a 19-day export-control suspension, Fable 5 returned to Claude Code on 2026-07-01 (see claude.ts).
2026-06-30•Anthropic news (anthropic.com/news/claude-sonnet-5), Anthropic (anthropic.com/news/redeploying-fable-5)
BILLING CHANGE PAUSED -- NOTHING CHANGES FOR NOW (status as of 2026-06-18): Anthropic had announced (~2026-05-13/14) that, effective 2026-06-15, programmatic Claude usage -- the Agent SDK, `claude -p` non-interactive mode, Claude Code GitHub Actions, and third-party apps built on the Agent SDK -- would move OFF normal Pro/Max subscription limits onto a SEPARATE metered credit pool (Pro $20/mo, Max 5x $100, Max 20x $200) billed at API rates beyond that. Commentary pegged the effective increase for heavy CI / Agent-SDK users at 12x-175x. **Anthropic reversed course and PAUSED the overhaul just before the June 15 go-live, telling developers 'Nothing changes for now.'** As of today, programmatic Claude Code usage (Agent SDK, `claude -p`, GitHub Actions) still draws on your regular Pro/Max subscription limits -- there is NO separate credit pool in effect (Anthropic's own cost docs at code.claude.com/docs/en/costs describe normal subscription/API billing, not a programmatic credit pool). Reporting attributes the reversal to the OpenAI price war, Anthropic's pending IPO filing, and government pressure over model access. Treat the credit-pool plan as shelved-but-not-dead and re-check before architecting around it. NOTE: this is DISTINCT from the 2026-06-15 Sonnet 4 / Opus 4 MODEL retirement, which DID take effect (see claude.ts).
2026-06-18•The Decoder (the-decoder.com/anthropic-backs-off-unpopular-billing-overhaul-as-price-war-with-openai-looms/), Axios (2026-05-14), Anthropic Claude Code cost docs (code.claude.com/docs/en/costs) -- earlier announcement: The New Stack, VentureBeat (2026-05-13/14)

Issues here are sourced from our editorial sweeps, not real-time telemetry. Newer issues may exist.

What to use if Claude Code is down

Top AIToolTier-ranked alternatives in the same category, ordered by our overall score.

A

GitHub Copilot

8.3

AI code assistant that lives in your editor -- autocomplete on steroids, now with the broadest model picker of any coding tool. **Three frontier models landed in four days: Claude Fable 5.1 (2026-09-01), Gemini 3.8 Flash (2026-09-03) and GPT-6 Astra (2026-09-04)** -- Astra and Gemini auto-enable under default model enablement, but **Fable 5.1 is OFF by default because it requires data retention** to run Anthropic's safety classifiers. **A four-model deprecation slate hits 2026-10-02** (Gemini 3.5/3.6 Flash, Kimi K2.7 Code, Claude Opus 4.7), and **Business/Enterprise card/PayPal customers move to upfront per-seat charging on 2026-10-01**. **Gemini 3.7 Flash landed 2026-08-13 and Grok 4.6 on 2026-08-14**, both across Pro, Pro+, Max, Business and Enterprise and both still off by default for orgs. **Claude Opus 5 landed 2026-07-24** (Pro+, Max, Business, Enterprise) and **Grok 4.5 on 2026-07-28** (all five paid SKUs, up to 500K context, text and image input, low/medium/high reasoning effort). Both bill usage-based at provider list price, and both are off by default for Business/Enterprise until an admin enables the policy -- though that posture flips on **2026-08-26**, when new GA models covered by GitHub's data-retention agreement start auto-enabling for orgs. **MAI-Code-1.1-Flash landed 2026-08-11** (native vision, 0.25x premium-request multiplier, 73% below the model it replaces; automatic for Free/Student, manual elsewhere, off by default for orgs) and **MAI-Code-1-Flash retires 2026-09-10**. **GitHub Models (the separate free playground) was fully retired 2026-07-30.** Usage-based billing went live 2026-06-01 with AI Credits and token metering; code completions are still free; new signups for Student/Pro/Pro+/Max remain PAUSED

A

Cursor

8.3

AI-native code editor, agent-first in Cursor 3 -- **now a SpaceX subsidiary as of 2026-08-14, when the April acquisition option closed**. **OpenAI is cutting it off: on 2026-08-28 OpenAI notified SpaceX it will wind down the contract supplying OpenAI models to Cursor, proposed shutoff 2026-11-12, and says it is providing no future models to Cursor in the meantime** -- so the model-neutrality pitch is narrowing. Still home to **Grok 4.6 on day one (2026-08-12)**, following the Grok 4.5 model Cursor trained jointly with SpaceXAI on trillions of Cursor tokens (still $2/$6 per 1M, fast variant 2x, desktop/web/iOS/CLI/SDK), with Composer 2.5 as the fast lower-cost tier. Since 2026-08-11 the **Cursor Ultra and Teams Premium tiers also entitle you to xAI's Grok Bot**

A

Codex (OpenAI)

8.3

OpenAI's coding agent -- parallel tasks, PRs, and as of 2026-07-09 merged into the unified ChatGPT desktop app (Chat + Work + Codex, every plan incl. Free) with GPT-5.6 across the lineup. **GPT-6 Astra arrived 2026-09-03 with a rewritten Codex harness -- OpenAI claims 1.9x faster task completion vs GPT-5.6 Sol on Mind2Web**, though that figure combines the harness change with the model. GPT-5.4 and 5.4-mini left Codex on 2026-08-31

A

Google Antigravity

8.0

Google's agent-first AI IDE -- deploys up to 5 autonomous coding agents in parallel on a VS Code fork. Antigravity 2.0 (I/O 2026) is the runtime substrate for Gemini Spark, and the Antigravity CLI is now the official successor to Gemini CLI, which stopped serving consumer tiers on 2026-06-18

A

Roblox Assistant

8.0

Roblox Studio's agentic AI that plans, builds, and playtests games. Planning Mode (2026-04-16) + Mesh Generation + Procedural Models brings 3D-native creation to 70M+ daily creators

About Claude Code

Tier B (7.8/10). Anthropic's terminal-based coding agent that reads your whole repo and makes real changes -- not just suggestions. v2.1.131 (2026-05-06 Code with Claude conf) shipped Code Review GA + Remote Agents + CI Auto-Fix + Routines, plus 2x rate-limit increase from the SpaceX compute deal. **Claude Fable 5.1 (2026-09-01) is the new top model and defaults to High effort in Claude Code specifically** -- Medium on every other Anthropic surface -- at an unchanged $10/$50 per 1M with cache reads cut 4x to $0.25/MTok

Read the full Claude Codereview →