GPT-4o vs Claude Sonnet 4.6: Which Costs Less in 2026?
The two most popular LLMs for production workloads go head-to-head on pricing, quality benchmarks, and real-world cost per task.
GPT-4o
Claude Sonnet 4.6
Pricing Comparison
| Metric | GPT-4o | Claude Sonnet 4.6 | Winner |
|---|---|---|---|
| Input / 1M tokens | $2.50 | $3.00 | GPT-4o (17% cheaper) |
| Output / 1M tokens | $10.00 | $15.00 | GPT-4o (33% cheaper) |
| Cached input / 1M | $1.25 | $0.30 | Claude (76% cheaper) |
| Batch input / 1M | $1.25 | $1.50 | GPT-4o (17% cheaper) |
| Context window | 128K | 200K | Claude (56% more) |
Quality Benchmarks
| Benchmark | GPT-4o | Claude Sonnet 4.6 | Winner |
|---|---|---|---|
| CIS (Composite) | 87.2 | 89.1 | Claude |
| Arena Elo | 1381 | 1388 | Claude |
| GPQA Diamond | 53.6 | 65.0 | Claude (+21%) |
| SWE-bench | 38.0 | 62.3 | Claude (+64%) |
| MATH-500 | 76.6 | 88.0 | Claude (+15%) |
| HumanEval | 90.2 | 93.0 | Claude (+3%) |
Key Finding
Claude Sonnet 4.6 wins every benchmark category, with particularly large leads in coding (SWE-bench +64%) and reasoning (GPQA +21%). GPT-4o wins on base pricing, being 17-33% cheaper per token.
Cost Per Task (Real-World)
| Task | GPT-4o | Claude Sonnet 4.6 | Cheaper |
|---|---|---|---|
| Chat reply (800 tokens) | $0.005 | $0.007 | GPT-4o |
| Code review (3K in, 1K out) | $0.018 | $0.024 | GPT-4o |
| Document summary (2K in, 500 out) | $0.010 | $0.014 | GPT-4o |
| RAG query (4K in, 500 out) | $0.015 | $0.020 | GPT-4o |
| Long context (50K cached, 1K out) | $0.073 | $0.030 | Claude (cached wins) |
When to Use Each Model
- Choose GPT-4o when: Budget is the primary concern, high-volume chat/summarisation, batch processing, simpler tasks where the quality gap doesn't matter
- Choose Claude Sonnet 4.6 when: Code generation, complex reasoning, long-context tasks (200K vs 128K), tasks where quality directly impacts revenue, cached workloads
The Verdict
GPT-4o is 17-33% cheaper per token, but Claude Sonnet 4.6 delivers measurably better quality across every benchmark. For cost-sensitive high-volume workloads, GPT-4o wins. For quality-sensitive tasks (especially coding and reasoning), Claude's higher quality per dollar makes it the better investment. For cached/long-context workloads, Claude's $0.30/1M cached pricing is unbeatable.
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