Done comparing? Build a legal app powered by Claude 4 Opus.
Build with Claude 4 Opus freeGPT-5.4 vs Claude 4 Opus for Legal
Which AI model is better for legal? We compare GPT-5.4 and Claude 4 Opus on the criteria that matter most - with a clear verdict.
Why your legal LLM choice matters
Legal applications demand precision above all else - a poorly worded clause or missed risk can have significant financial and legal consequences. The best legal LLMs combine large context windows for full-document review with careful, disclaimer-aware output and the ability to identify ambiguous or missing language.
Key evaluation criteria for legal
Side-by-Side Comparison
| Feature | GPT-5.4 | Claude 4 OpusWinner |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Model Type | text | text |
| Context Window | 1,050,000 tokens | 200,000 tokens |
| Input Cost | $2.50/ 1M tokens | $15.00/ 1M tokens |
| Output Cost | $15.00/ 1M tokens | $75.00/ 1M tokens |
| Top pick for Legal |
Strengths for Legal
GPT-5.4
OpenAI1. Best Intelligence at Scale
- OpenAI positions GPT-5.4 as its frontier model for agentic, coding, and professional workflows.
- Built for complex professional work where stronger reasoning and higher answer quality matter.
2. Configurable Reasoning + Multimodal Input
- Supports configurable reasoning effort from none to xhigh, letting teams balance speed and depth.
- Accepts both text and image inputs while producing text output.
3. Massive Context for Long-Running Work
- 1.05M token context window supports very large codebases, documents, and multi-step workflows.
- Allows up to 128 k output tokens for long-form answers and larger generations.
4. Updated Knowledge & Broad Tool Support
- Knowledge cut-off of Aug 31 2025 keeps it current for newer frameworks and business context.
- Supports tools like web search, file search, code interpreter, hosted shell, computer use, and MCP in the Responses API.
Claude 4 Opus
Anthropic- Highest capability in the family: described as “our most powerful model yet” by Anthropic.
- Exceptional at long-running tasks requiring thousands of steps and sustained focus (e.g., continuous codebase work for hours).
- Excellent performance on benchmarks: e.g., SWE-bench 72.5 % and Terminal-bench 43.2 %.
- Designed for complex agentic workflows, deep reasoning, tool use, and large context windows.
- Placed under a higher safety classification (ASL-3) due to its frontier capability and risk profile.
Verdict: Best LLM for Legal
For legal tasks, Claude 4 Opus edges ahead based on its performance profile and design priorities. It scores higher on precision and accuracy in legal language - the criterion that matters most for legal workflows.
That said, GPT-5.4 remains a strong option. If handling long documents within context window is a higher priority than raw performance, or if your team is already using OpenAI's tooling, GPT-5.4 can deliver strong results for legal workloads.
With Appaca, you can build legal apps powered by either model and switch between them at any time - no rebuild required. Test what actually performs best for your users before committing.
You know Claude 4 Opus wins for legal. Now build with it.
Most teams spend days comparing models and hours copy-pasting prompts. With Appaca, you build a dedicated legal app - powered by Claude 4 Opus - in minutes. No code, no re-prompting, runs on any device.
Free to start. Switch models any time. No rebuild required.
Build a legal app with Claude 4 Opus - freeFrequently asked questions
Is GPT-5.4 or Claude 4 Opus better for legal?
For legal tasks, Claude 4 Opus has the edge based on its performance profile and design priorities. It ranks higher on precision and accuracy in legal language, which is the most important criterion for legal workflows. That said, both models can handle legal workloads - the best choice depends on your specific requirements and budget.
What are the key differences between GPT-5.4 and Claude 4 Opus for legal?
The main differences are in precision and accuracy in legal language, ability to identify risks and ambiguous clauses, appropriate caveats and professional disclaimers. GPT-5.4 is developed by OpenAI and comes from a different provider than Claude 4 Opus. Context window, pricing, and speed all differ - check the comparison table above for a side-by-side breakdown.
How much does it cost to use GPT-5.4 vs Claude 4 Opus?
GPT-5.4 is cheaper at $2.50/million input tokens, versus $15.00/million for Claude 4 Opus. For legal workloads, the total cost difference depends on your average prompt length and volume.
Can I build a legal app with GPT-5.4 or Claude 4 Opus?
Yes. Both models can power legal applications. With Appaca, you can build a legal app using either GPT-5.4 or Claude 4 Opus - and switch between them at any time to find the model that performs best for your specific workflow, without rebuilding your product.
Which model should I choose if I care most about precision and accuracy in legal language?
Claude 4 Opus is the stronger choice when precision and accuracy in legal language is your top priority. It ranks #1 overall for legal tasks. If cost or latency are constraints, GPT-5.4 may still meet your needs at a lower cost.