Pairwise benchmark snapshot · Aug 17, 2026
In this head-to-head showdown, GPT-5.6 Luna delivers higher overall intelligence and human-preferred responses (Elo 1,466 vs 1,438), while GPT-5.6 Luna leads in SWE-bench software engineering benchmarks (61.8%), while GPT-5.6 Luna is more budget-friendly at $0.6/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
10 direct benchmark disciplines evaluated across capability, speed, and cost
Anthropic cheap/fast Claude SKU. Official Claude Platform list price $1/$5 per 1M tokens (Anthropic Haiku page).
OpenAI 5.6 fast/cheap tier. Official API $0.20/$1.20 per 1M after the Jul 30 80% Luna cut.
Currently comparing Claude Haiku 4.5 vs GPT-5.6 Luna. Alternative family tiers available.
Δ 28 Arena Elo pts
188 tok/s
$0.6 / 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 Haiku 4.5 | GPT-5.6 Luna | Advantage Delta |
|---|---|---|---|
| Preference Elo | +28 | ||
| Coding Elo | +12 | ||
| LiveBench | +1.8% | ||
| SWE-bench | +3.6% | ||
| GPQA Diamond | +1.4% | ||
| Time to first token | +7 ms | ||
| Output speed | 175 tok/s | 188 tok/s | +13 tok/s |
| Input price | $0.1/1M | +$0.9/1M | |
| Output price | $0.6/1M | +$4.4/1M | |
| Context window | +850k |
Simulate monthly production API costs in USD (US Dollar).
GPT-5.6 Luna is estimated to save $97.50/month ($1,170/year).
Higher SWE-bench (61.8%).
Lower output list price ($0.6/1M).
Lower TTFT (88 ms).
Larger window (1.1M).
Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Luna).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | GPT-5.6 Luna | Higher SWE-bench (61.8%). |
| High-volume chat | GPT-5.6 Luna | Lower output list price ($0.6/1M). |
| Voice / low-latency UI | GPT-5.6 Luna | Lower TTFT (88 ms). |
| Long-document RAG | GPT-5.6 Luna | Larger window (1.1M). |
| Screenshots / vision | GPT-5.6 Luna | Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Luna). |
$1/$5 hosted Claude vs a cheap long-context open sibling. The alternative-to-Sonnet pair that is honest.
Luna is the OpenAI fast/cheap 5.6 SKU after Jul 30. It is not Sol. Sort by price and TTFT, not Elo.
Huge window, cheap hosted lists. The Haiku alternative that is actually open-weight.
Official Anthropic list $1/$5. This is the SKU behind “cheapest Claude alternative” that is still Claude.
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Verified Head-to-Head Telemetry
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