How to Use Claude Like ChatGPT

Developers frequently search “how to use Claude like ChatGPT” because they love Claude’s surgical code refactoring, but miss ChatGPT’s conversational flexibility — or get tired of constantly juggling two separate browser tabs and distinct keyboard shortcuts.

The secret is not picking one lab over the other. The modern developer workflow unifies both engines under a single terminal surface where Claude and ChatGPT execute in parallel, respond to identical prompts, and let you accept the winning output with a single keystroke.

Where Claude and ChatGPT Actually Differ

Understanding each model’s superpower helps you stop treating them as mutually exclusive tools:

• Claude (Sonnet 3.7 / Fable 5.1): Superior at deeply nested codebases, avoiding hallucinated imports, following strict formatting constraints, and large file refactoring without losing context.
• ChatGPT (GPT-4o / GPT-6 Astra): Faster at greenfield scaffolding, database schema design, broad architectural ideation, and conversational back-and-forth debugging.

The Problem: Tab Juggling and Double Billing

When developers try using both models manually, they hit three major bottlenecks:

1. Copy-Paste Context Loss: Switching browser windows, pasting the same prompt twice, and losing terminal shell context.
2. Metered API Stacking: Setting up separate credit balances with Anthropic and OpenAI, paying per token every time you want a second opinion.
3. Inconsistent Output Formatting: Comparing two raw chat outputs without a unified color diff or an automated way to pipe the accepted solution back into your editor.

The Solution: Unified Terminal Duel with MegaPad

With the open-source MegaPad CLI (mechapad-cli), you can bridge your existing subscriptions and execute Claude and ChatGPT side-by-side in your terminal with zero API keys:

# Install globally
npm install -g mechapad-cli

# Run Claude and ChatGPT in a parallel terminal duel
pad vs openai "Write a lock-free ring buffer in Rust"

How It Works Under the Hood

MegaPad inspects your local environment for active sessions (such as Claude Code at ~/.claude and ChatGPT Codex at ~/.codex). Both models execute concurrently, streaming tokens side-by-side with microsecond telemetry:

• Latency: Measure exact time-to-first-token and completion time.
• Speed: Compare live tokens/second generation speed.
• Cost Comparison: Live calculation of token economics.

Interactive Hotkey Controls

Once execution finishes, you don’t copy code from a web browser. You select the winning implementation instantly from your keyboard:

Summary: Stop Choosing, Start Dueling

You don't need to replace ChatGPT with Claude or vice versa. By treating frontier models as parallel execution engines, you get the reasoning depth of Claude combined with the broad speed of ChatGPT — with zero API keys and zero browser tabs.