Pairwise benchmark snapshot · Aug 16, 2026
In this head-to-head showdown, Claude Sonnet 5 delivers higher overall intelligence and human-preferred responses (Elo 1,556 vs 1,548), while Claude Sonnet 5 leads in SWE-bench software engineering benchmarks (73.8%), while Claude Sonnet 5 is more budget-friendly at $10/1M per 1M output tokens, while GPT-5.6 Terra provides faster response streaming (128 tok/s). Review the complete breakdown below to determine which model best fits your performance and budget requirements.
8 direct benchmark disciplines evaluated across capability, speed, and cost
Anthropic workhorse. Official $2/$10 per 1M tokens made permanent on Aug 10 2026.
OpenAI 5.6 mid tier. Official API $2/$12 per 1M after the Jul 30 2026 price cut.
Currently comparing Claude Sonnet 5 vs GPT-5.6 Terra. Alternative family tiers available.
Δ 8 Arena Elo pts
128 tok/s
$10 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Comparing top Western standard models with China's leading frontier rival across 6 skill dimensions. Tap any spoke or dot to inspect.
Category wins across reasoning intelligence, generation speed, and token cost.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
| Benchmark | Claude Sonnet 5 | GPT-5.6 Terra | Advantage Delta |
|---|---|---|---|
| Preference Elo | +8 | ||
| Coding Elo | +20 | ||
| LiveBench | +1.3% | ||
| SWE-bench | +3.4% | ||
| GPQA Diamond | +0.8% | ||
| Time to first token | +15 ms | ||
| Output speed | 118 tok/s | 128 tok/s | +10 tok/s |
| Input price | — | ||
| Output price | +$2/1M | ||
| Context window | — |
Simulate monthly production API costs in USD (US Dollar).
Claude Sonnet 5 is estimated to save $30.00/month ($360/year).
Higher SWE-bench (73.8%).
Lower output list price ($10/1M).
Lower TTFT (160 ms).
Larger window (1M).
Both accept images. Defaulting to the higher-Elo side (Claude Sonnet 5).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Claude Sonnet 5 | Higher SWE-bench (73.8%). |
| High-volume chat | Claude Sonnet 5 | Lower output list price ($10/1M). |
| Voice / low-latency UI | GPT-5.6 Terra | Lower TTFT (160 ms). |
| Long-document RAG | Claude Sonnet 5 | Larger window (1M). |
| Screenshots / vision | Claude Sonnet 5 | Both accept images. Defaulting to the higher-Elo side (Claude Sonnet 5). |
Usually Sonnet 5 vs Opus 5. Coding delta versus output $/1M. The workhorse question.
Aug 10 2026 made the $2/$10 list permanent. Sonnet is the default Claude unless the repo is actually on fire.
Terra is OpenAI’s Sonnet-class invoice. Use it when Sol is too expensive and Luna is too small.
Most of Opus 4.5 coding at a mid-tier price. Sonnet 5 replaced it as the buy; 4.5 remains a compare baseline.
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Verified Head-to-Head Telemetry
price · Jul 30, 2026
GPT-5.6 Terra after the Jul 30 cut: $2/$12 mid-tier
compare · Aug 10, 2026
Sonnet vs Opus in 2026: same family, different invoice
price · Aug 10, 2026
Claude Sonnet 5 at $2/$10: the 2026 Anthropic workhorse
launch · Feb 18, 2026
Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline