LatestAPI Guides
Is There a Free AI Video API? What Works Without Paying
As of September 30, 2026, no major video model's API lists a free tier. Magic Hour and Tavus offer free trials; a 5-second Veo 3.1 Lite test costs $0.25.
12 min
Built for real engineering decisions
AI Model & API Guides
Source-linked guidance for AI models, API integration, and developer workflows—turning fast-changing prices, quotas, capabilities, and limits into decisions you can verify.
- Primary sources first
- Reproducible steps and failure boundaries
- Volatile facts carry review dates
- 478 articles
- 6 languages
- 12 topics
- Updated Sep 30, 2026
ChatGPT & OpenAI
How Many Files Can You Upload to ChatGPT? Free, Go, Plus, Pro
ChatGPT Free allows 3 file uploads a day; paid plans get up to 80 files every 3 hours. Projects, custom GPTs, file size and storage each have their own cap.
12 min
AI Image Generation
Does ChatGPT Save Your Photos? Where Uploads Go and How to Delete
Yes. ChatGPT keeps an uploaded photo in the chat, and often in Library, until you delete it. Training depends on one setting; deletion finishes within 30 days.
10 min
Claude & Anthropic
Claude "Temporarily Unable to Authenticate": Outage or Local Fix?
Anthropic's service sends it, not your login. Check status.claude.com: during an incident stay signed in and retry slowly; fix locally only if none is posted.
16 min
Developer Tools & Agents
Codex Computer Use: Setup on Mac and Windows, and When to Use It
Computer Use now runs in the ChatGPT desktop app on macOS and Windows, in Work or Codex. Install the plugin, grant OS access, then mention @Computer or an app.
13 min
API Guides
Gemini 3.8 Flash TTS API: Model Choice, Cost, and Migration
Both Gemini 3.8 TTS models are GA with a free tier. Flash-Lite replaces 3.1 preview at about $0.54 per audio hour; Flash is $0.81 for studio-grade acting.
16 min
API Pricing & Plans
GPT-6.1 Sol: Pricing, Access, and What Breaks When You Switch
GPT-6.1 Sol keeps GPT-6 Sol's $2/$10 rates but halves cached input to $0.10. Requests using none effort or Chat Completions tools must change.
13 min
Model Comparisons
GPT-6.1 Sol vs GPT-6 Astra vs GPT-6 Sol: When Astra Is Worth It
Move gpt-6-sol traffic to GPT-6.1 Sol: same price, higher scores at every effort. Run it one level higher to match Astra for 3–5x less; Astra max has no equal.
14 min
Troubleshooting
Grok Authentication Failure: What Each Login Error Means
"Authentication failure: user is blocked" most likely means an account block only xAI can lift. Most other Grok sign-in errors you can fix yourself.
14 min
AI Video Generation
How Much Does an AI Video Generator Cost Per Month and Per Clip?
As of September 2026, creator plans run about $5–$35 a month and APIs charge $0.04–$0.25 per second at 720p. Sora is gone, and retries set the real cost.
15 min
Developer Tools & Agents
Codex Mobile App: Control a Mac or Windows PC From Your Phone
There is no separate Codex app. Open Codex in the ChatGPT app on iPhone or Android, then pair it by QR code with a Mac or Windows PC running ChatGPT.
12 min
AI Video Generation
Sora 2 API Shut Down: What Still Works and What to Switch To
The Sora 2 API no longer works. OpenAI shut it down on September 24, 2026, with no replacement; only Azure Foundry's preview remains, until October 15.
10 min
Claude Code
Claude Code 403, 503, and 529 Errors: Find the Source, Then Fix
A 403, 503, or 529 in Claude Code can come from your proxy, your Anthropic account, Anthropic's capacity, or a gateway in between. Run /status first.
14 min
Model Comparisons
Claude Sonnet 5.5 vs GPT-6 Astra: When the Cheaper Model Wins
Sonnet 5.5 beats GPT-6 Astra only at max effort, at a higher cost per task. Astra leads from low to high, ties at xhigh; Sonnet's low rates win on long inputs.
16 min
Model Comparisons
Claude Sonnet 5.5 vs Opus 5.5: When Half the Price Really Saves
Sonnet 5.5 costs half as much per token and suits well-scoped work at low or medium effort. Push it to max effort and it can cost more per task than Opus 5.5.
17 min
API Guides
Nano Banana API Docs and Tutorial: Key, Model IDs, and Code
Nano Banana is Gemini's image model family, called through the Gemini API with an AI Studio key. Start with gemini-3.1-flash-image on the Interactions API.
14 min
Claude Code
Claude Code API Overloaded (529): Switch Models or Add a Fallback
Claude Code shows a 529 overload only after retrying up to 10 times, and it never counts against your quota. Switch models with /model or set a fallback chain.
10 min
API Guides
Free Gemini API Key for Students: What Is Free and What Isn't
No student-only Gemini API key exists; students get the same free tier as everyone. The Google AI Pro student year helps API work only after you enable billing.
15 min
AI Tools & Guides
Grok Free Limit: What xAI Publishes, How It Resets, What to Do
xAI publishes no message count for free Grok as of September 27, 2026. Free Chat and Voice have their own limit and reset; check Settings → Usage before paying.
14 min
API Guides
OpenRouter Alternatives: Free Models, Fees, and When to Switch
OpenRouter's free models cap at 50 requests a day until a one-time $10 top-up; Vercel, Requesty, Cloudflare, LiteLLM, or direct free tiers each fix one problem.
16 min
Developer Tools & Agents
Google AI Studio Free Access: What's Still Free and What Isn't
AI Studio is still free for adults in supported countries, but since April 20, 2026, Gemini Pro and Nano Banana need Google AI Pro/Ultra or a paid API key.
12 min
API Pricing & Plans
ChatGPT Plus vs API: Is the API Cheaper Than $20 a Month?
Plus is $20 a month and the API is billed separately. Short, occasional chats cost less on the API; long daily threads, reasoning and Codex favor Plus.
11 min
API Pricing & Plans
Cheapest LLM API Provider: Where the Same Model Costs Less
No provider wins for every model. As of September 26, 2026, DeepSeek direct off-peak costs half of hosts charging its peak rate; check versions and router fees.
13 min
API Pricing & Plans
AI API Price Comparison: Cheapest Model by Input and Output Mix
As of September 26, 2026, GPT-6 Luna and DeepSeek Flash cost least per token. Among $2-input models, Grok 4.7 is cheapest; past 272K tokens, Sonnet 5 beats Sol.
15 min