Review of Claude 4
Claude 4 is Anthropic's flagship LLM, released in 2026. It comes in two tiers: Sonnet (mid-range, faster, cheaper) and Opus (top-tier, slower, more capable). Both have 200K+ token context windows, support tool use, and are available via API, web, and mobile apps.
GPT-5 is more creative and faster on simple queries. Claude 4 is more careful, more honest about uncertainty, and better at long-form structured output. For coding, both are excellent (Claude 4 is slightly better at multi-file refactors, GPT-5 is slightly better at one-shot generation). For writing, Claude 4 is the gold standard.
Gemini 2.5 Pro has 1M+ token context (Claude 4 has 200K). For huge documents, Gemini wins. For everything else, Claude 4 wins on quality. Gemini is cheaper ($1.25/M input vs $3/M for Claude Sonnet 4) but the quality difference is real.
Claude 4 Sonnet scores 88% on HumanEval+, GPT-5 scores 92%, Gemini 2.5 Pro scores 87%. On SWE-bench (real GitHub issues), Claude 4 Opus leads at 78%, GPT-5 at 76%, Gemini 2.5 Pro at 71%. Claude wins on real-world coding tasks.
Claude 4 is the best model for long-form writing. It maintains tone, structure, and coherence over 10K+ word outputs. GPT-5 tends to get repetitive. Gemini 2.5 Pro is too clinical. If you write for a living, Claude 4 is the right pick.
On GPQA (graduate-level reasoning), Claude 4 Opus scores 89%, GPT-5 scores 86%, Gemini 2.5 Pro scores 84%. On MATH, Claude 4 Opus scores 95%, GPT-5 scores 93%, Gemini 2.5 Pro scores 90%. Claude wins on hard reasoning.
Claude 4 Sonnet: ~80 tokens/second. Claude 4 Opus: ~30 tokens/second. GPT-5: ~120 tokens/second. Gemini 2.5 Pro: ~150 tokens/second. Claude is the slowest of the three. If speed matters, use Sonnet, not Opus.
Claude 4: 200K tokens (1M for some enterprise customers). GPT-5: 128K tokens. Gemini 2.5 Pro: 1M tokens. For huge documents (entire books, large codebases), Gemini wins. For typical use, 200K is more than enough.
Claude 4 supports tool use, function calling, and computer use (the ability to control a browser). It's competitive with GPT-5 here. Gemini 2.5 Pro is also good but slightly behind.
Anthropic is the most cautious lab. Claude 4 refuses more requests than GPT-5 or Gemini 2.5 Pro. For most use cases this is fine. For edge cases (creative writing with violence, security research), it can be annoying. Use the system prompt to set boundaries.
Claude 4 Sonnet: $3/M input, $15/M output. Claude 4 Opus: $15/M input, $75/M output. GPT-5: $2.50/M input, $10/M output. Gemini 2.5 Pro: $1.25/M input, $5/M output. Sonnet is comparable to GPT-5 on price. Opus is 2-3x more expensive.
Writers, editors, researchers, analysts, and anyone who needs long-form, high-quality output. Coders who need multi-file refactors. Anyone who values honesty and uncertainty acknowledgment over confidence.
Speed-critical applications (use Gemini 2.5 Pro or GPT-5). Users with >200K token needs (use Gemini 2.5 Pro). Anyone on a tight budget and okay with slightly lower quality (use Gemini 2.5 Pro).
Claude 4 is the best LLM for most use cases in 2026. It wins on writing, coding, and reasoning. It's slower and more expensive than Gemini 2.5 Pro, but the quality difference is worth it. Use Sonnet for production, Opus for the hardest tasks.
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