Is GPT-5.4-Cyber (OpenAI) down right now?

We do not run live uptime probes. To verify GPT-5.4-Cyber (OpenAI)'s current status, check the vendor's official status page, DownDetector, or the vendor's X feed. Links are on this page.

What should I use if GPT-5.4-Cyber (OpenAI) is down?

The top AIToolTier-ranked alternatives to GPT-5.4-Cyber (OpenAI) are Muse Spark (Meta), Claude (Anthropic), Gemini (Google). Full list and tier rankings are on this page.

Is GPT-5.4-Cyber (OpenAI) Down?

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

Last editorial review: 2026-04-19

How to check right now

Step 1 -- Load the site

Open openai.com→

The simplest check. If it loads and you can log in, the tool is up for you.

Step 2 -- Crowdsourced reports

DownDetector: GPT-5.4-Cyber (OpenAI)→

User-reported outages aggregated across regions. Good signal for partial or regional outages.

Step 3 -- Live social

Search X for “GPT-5.4-Cyber (OpenAI)down” →

Live tweets from other users. Fastest signal for a fresh outage -- often beats status pages by 10-20 minutes.

Step 4 -- Official status page

Find GPT-5.4-Cyber (OpenAI)'s status page →

Most vendors publish a status page at status.[domain] or on Statuspage.io. Google-search to find the current URL.

Known issues we've tracked

TAC enrollment is reviewed manually -- expect weeks to months for approval. Smaller individual researchers have reported being declined or put on hold; enterprise SOC teams with a named account manager get faster turnaround

2026-04•CyberScoop, AI Business coverage

Direct competitive positioning vs. Claude Mythos Preview. Both are gated-access cyber-tuned frontier models as of April 2026. If you get declined by one, applying to the other is a reasonable next step -- the programs are not exclusive with each other

2026-04•OpenAI + Anthropic launch posts, The Hacker News

No public benchmark scores vs. Claude Mythos. Both vendors cite internal cyber-capability evals but neither has released a shared third-party benchmark, so head-to-head comparisons are anecdotal as of April 2026

2026-04•OpenAI announcement, Anthropic Mythos announcement

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

What to use if GPT-5.4-Cyber (OpenAI) is down

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

Muse Spark (Meta)

8.8

Meta's first model from its Superintelligence Lab -- natively multimodal with Contemplating mode for multi-agent reasoning

Claude (Anthropic)

8.5

Anthropic's flagship LLM -- Opus 4.7 (launched April 16, 2026) with 1M-token context, high-res vision, new xhigh reasoning level, and the most natural conversational style

Gemini (Google)

8.3

Google's LLM with deep Google Workspace integration, 2M token context window, and native code execution

Grok

7.5

xAI's irreverent chatbot with a direct line to X/Twitter -- real-time data meets unfiltered personality

GPT-Rosalind (OpenAI)

6.8

OpenAI's first domain-specific model -- life sciences, drug discovery, translational medicine. Launched 2026-04-16 as a Trusted Access research preview. Launch partners: Amgen, Moderna, Allen Institute, Thermo Fisher. Paired with a Life Sciences Codex plugin (50+ scientific tool integrations)

About GPT-5.4-Cyber (OpenAI)

Tier B (7.2/10). OpenAI's defensive-cybersecurity variant of GPT-5.4, launched 2026-04-16. Lowered refusal boundary for security-research tasks and native binary reverse-engineering. Access gated via Trusted Access for Cyber (TAC) program -- thousands of verified defenders, hundreds of teams, no public pricing

Read the full GPT-5.4-Cyber (OpenAI)review →