Pairwise benchmark snapshot · Aug 16, 2026
In this head-to-head showdown, GPT-5.6 Terra delivers higher overall intelligence and human-preferred responses (Elo 1,548 vs 1,438), while GPT-5.6 Terra leads in SWE-bench software engineering benchmarks (70.4%), while Claude Haiku 4.5 is more budget-friendly at $5/1M 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 mid tier. Official API $2/$12 per 1M after the Jul 30 2026 price cut.
Currently comparing Claude Haiku 4.5 vs GPT-5.6 Terra. Alternative family tiers available.
Δ 110 Arena Elo pts
175 tok/s
$5 / 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 Terra | Advantage Delta |
|---|---|---|---|
| Preference Elo | +110 | ||
| Coding Elo | +96 | ||
| LiveBench | +6.7% | ||
| SWE-bench | +12.2% | ||
| GPQA Diamond | +8% | ||
| Time to first token | +65 ms | ||
| Output speed | 175 tok/s | 128 tok/s | +47 tok/s |
| Input price | +$1/1M | ||
| Output price | +$7/1M | ||
| Context window | +800k |
Simulate monthly production API costs in USD (US Dollar).
Claude Haiku 4.5 is estimated to save $140.00/month ($1,680/year).
Higher SWE-bench (70.4%).
Lower output list price ($5/1M).
Lower TTFT (95 ms).
Larger window (1M).
Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Terra).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | GPT-5.6 Terra | Higher SWE-bench (70.4%). |
| High-volume chat | Claude Haiku 4.5 | Lower output list price ($5/1M). |
| Voice / low-latency UI | Claude Haiku 4.5 | Lower TTFT (95 ms). |
| Long-document RAG | GPT-5.6 Terra | Larger window (1M). |
| Screenshots / vision | GPT-5.6 Terra | Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Terra). |
$1/$5 hosted Claude vs a cheap long-context open sibling. The alternative-to-Sonnet pair that is honest.
Terra is OpenAI’s Sonnet-class invoice. Use it when Sol is too expensive and Luna is too small.
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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