Smart AI Workflow for Migration Projects

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Question: Is it a good idea to use OpenClaw with MiniMax M2.7 for complex agentic tasks, and escalate to Claude Sonnet 4.6 via web chat for difficult decisions? Specifically for a PHP 7.x → PHP 8.x and CodeIgniter 3 → 4 migration project — using cheap Chinese models for execution and Claude for key architectural decisions?

Answer:

Short Answer: Yes — This Is a Smart Tiered Workflow

Your instinct is solid. This is essentially a “cheap model for execution, smart model for decisions” pattern, and it aligns well with how professional engineering teams are increasingly structuring AI-assisted workflows in 2026.

Understanding the Stack

OpenClaw + MiniMax M2.7

MiniMax M2.7 is built on the OpenClaw agent framework and autonomously ran over 100 rounds of scaffold optimization during training, achieving a 30% performance improvement — without human intervention.

M2.7 costs $0.30 per million input tokens and $1.20 per million output tokens, and the company claims it runs at less than one-third the cost of GLM-5 at equivalent intelligence levels.

On MiniMax’s own MMClaw evaluation (covering real-world tasks in work and life), M2.7 achieved 62.7% accuracy, approaching Claude Sonnet 4.6’s level.

OpenClaw supports isolated agent workspaces, tool calling, image processing, and routing across messaging apps, and is built for coding agents, personal assistants, and multi-agent teams with seamless model swapping.

So for routine, repetitive migration work (file-by-file refactoring, boilerplate namespace changes, syntax substitutions), M2.7 in OpenClaw is very capable and extremely cost-effective.

Claude Sonnet 4.6 for Hard Decisions

This is where your workflow shines. Claude Sonnet 4.6 is better suited for:

Architectural decisions (e.g., how to restructure a legacy God-class controller)
Ambiguous migration trade-offs (e.g., whether to use CI4’s Model or inject a Repository pattern)
Security-sensitive logic (auth, session, CSRF handling changes between CI3 and CI4)
Writing the summarized “context brief” that you then feed back into OpenClaw

Why This Works Well for CI3→CI4 + PHP 7→8 Migration

CodeIgniter 4 is a rewrite of the framework, not backward compatible. It is more appropriate to think of converting your app rather than upgrading it. This means many decisions are non-trivial and benefit from deeper reasoning.

Key breaking changes that need smart handling:

Models must now be in app/Models with namespace App\Models and use CodeIgniter\Model — replacing extends CI_Model with extends Model.
Controllers move to app/Controllers with namespace App\Controllers and extends BaseController replacing extends CI_Controller.
Several helpers that existed in CI3 no longer exist in CI4, including the CAPTCHA Helper, Email Helper, Path Helper, and Smiley Helper.

These are the kinds of categorical decisions where you want Claude’s reasoning before letting OpenClaw execute hundreds of file changes.

On the PHP side, you should address deprecated functions (like create_function(), each()), modify function signatures for stricter type requirements, and consider using tools like Rector to automate some refactoring. Rector-style automated tasks are perfect for M2.7 in OpenClaw — it can run and verify them. But deciding which type coercions are safe is Claude territory.

Recommended Workflow Pattern

Here’s how to operationalize your idea:

Phase 1 — Decision Layer (Claude Sonnet 4.6 via web chat)

Feed Claude a module summary (not the whole codebase) and ask for the migration strategy for that module
Ask Claude to output a structured instruction brief: “Here are the 5 key decisions, here is the pattern to follow for each controller/model”
Use Claude’s extended thinking / deep think for ambiguous legacy patterns

Phase 2 — Execution Layer (OpenClaw + M2.7)

Feed the instruction brief into OpenClaw as the agent’s operating context
Let M2.7 execute the repetitive file conversions, namespace replacements, and syntax upgrades
M2.7 maintains a 97% skill adherence rate on 40 complex skills with over 2,000 token cases, which means it reliably follows detailed instructions

Phase 3 — Review Checkpoints (Claude again)

When M2.7 encounters ambiguity or produces something that doesn’t compile, copy that output to Claude
Ask Claude to diagnose and produce the corrected pattern, then resume OpenClaw

Caveats and Risks

Context fragmentation: When you copy summaries between tools, you risk losing nuance. Be deliberate about what context you pass to Claude — include the original CI3 code snippet AND the M2.7 attempt.
M2.7 hallucinations on edge cases: Even with strong AI tools, some features or nuances are missed during automated migration. Thorough review and testing of generated code is essential. Don’t let OpenClaw commit directly to production branches.
CI3→CI4 is a full rewrite: A small CI3 app with straightforward business logic can be migrated to CI4 in 2–4 weeks, but full rebuilds of complex applications can take 3–6 months. Set realistic expectations.
PHP version target: PHP 8.1 reached end of life on December 31, 2025. The currently supported PHP versions are 8.2 (until December 2026), 8.3 (until December 2027), and 8.4 (until December 2028). Target PHP 8.2+ minimum, not 8.1.

Summary Verdict

Layer	Tool	Use For
Key decisions	Claude Sonnet 4.6 (web chat)	Architecture, patterns, ambiguous logic, security
Execution	OpenClaw + MiniMax M2.7	File-by-file conversion, boilerplate, repetitive rewrites
Checkpoints	Claude Sonnet 4.6	Reviewing M2.7 output that fails or looks wrong

This tiered approach — strategic intelligence at the top, cheap execution at the bottom — is exactly the right way to balance cost and quality for a large migration project. Just be rigorous about your context briefs when switching between tools.

References:

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