The user wants me to write a blog article in Spanish about code security review, specifically a comparison type article. Let me analyze the requirements:

1. **Length**: 900-1200 words

2. **Structure**: Compelling intro → 3-4 H2 sections with substantial content → Conclusion with CTA

3. **Each H2 must include a practical prompt** with PROMPT: syntax

4. **Research mentally**: Concrete steps, real tools, specific metrics

5. **Practical examples**: At least 2 concrete examples

6. **Common mistakes**: A dedicated section

7. **Updated data 2026**: References to current versions of ChatGPT, Claude, Gemini

Style rules:

- Professional but close tone

- Perfect Spanish orthography with accents and ñ

- No markdown, no HTML

- No self-references

- Varied vocabulary

- Prompts with [variables]

- Output format: ## [Section Title] followed by content, then PROMPT:

Since it's a "comparativa" (comparison), I should compare tools for code security review - like comparing SAST tools, or comparing AI-assisted review vs traditional tools, or comparing different approaches. Let me think about what makes sense.

Option A: Compare AI assistants (ChatGPT, Claude, Gemini) for code review

Option B: Compare SAST tools (SonarQube, Snyk, Semgrep, etc.)

Option C: Compare AI-driven review vs traditional SAST

Given the mention of ChatGPT, Claude, Gemini in the requirements, I think comparing AI-assisted security review tools makes sense, perhaps comparing manual review, AI tools, and SAST tools. Or comparing what each AI offers for security review.

Let me go with a comparison of AI-powered security review approaches vs traditional static analysis vs manual review, OR comparing the three major AI assistants for this task.

Actually, let me structure it as:

1. Intro: Why security review needs to evolve in 2026

2. H2: The landscape - comparing approaches (SAST tools vs AI assistants vs hybrid)

3. H2: AI assistants compared (ChatGPT, Claude, Gemini) for code review

4. H2: Building a practical workflow (with example)

5. H2: Common mistakes section

6. Conclusion with CTA

Wait, I need 3-4 H2 sections minimum, with at least 3 including prompts. Let me plan:

Intro (no heading is fine, just intro paragraphs)

La evolución de la revisión de seguridad: SAST, IA y revisión manual

Content comparing traditional SAST vs AI-based review

Prompt
adaptable