Pairwise benchmark snapshot · Aug 16, 2026
In this head-to-head showdown, Claude Fable 5 delivers higher overall intelligence and human-preferred responses (Elo 1,616 vs 1,370), while Claude Fable 5 leads in SWE-bench software engineering benchmarks (80%), while Llama 3.1 405B is more budget-friendly at $3.5/1M per 1M output tokens, while Claude Fable 5 provides faster response streaming (58 tok/s). 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 top-tier X-High reasoning model engineered for heavy multi-step tasks. Official API $10/$50 per 1M tokens (Claude Platform pricing, Aug 2026).
Meta flagship open-weight 405B dense foundation model with 128k context window.
Currently comparing Claude Fable 5 vs Llama 3.1 405B. Alternative family tiers available.
Simulate accuracy gains vs added response time & token cost
Reasoning models “think before answering” by generating internal reasoning tokens. Higher effort improves math, coding, and logic accuracy, but increases response delay and token costs.
Δ 246 Arena Elo pts
58 tok/s
$3.5 / 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 Fable 5 | Llama 3.1 405B | Advantage Delta |
|---|---|---|---|
| Preference Elo | +246 | ||
| Coding Elo | +237 | ||
| LiveBench | +14% | ||
| SWE-bench | +21.6% | ||
| GPQA Diamond | +12.4% | ||
| Time to first token | +20 ms | ||
| Output speed | 58 tok/s | 42 tok/s | +16 tok/s |
| Input price | $1.25/1M | +$8.75/1M | |
| Output price | $3.5/1M | +$46.5/1M | |
| Context window | +872k |
Simulate monthly production API costs in USD (US Dollar).
Llama 3.1 405B is estimated to save $1,003.75/month ($12,045/year).
Higher SWE-bench (80%).
Lower output list price ($3.5/1M).
Lower TTFT (340 ms).
Larger window (1M).
Claude Fable 5 is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Claude Fable 5 | Higher SWE-bench (80%). |
| High-volume chat | Llama 3.1 405B | Lower output list price ($3.5/1M). |
| Voice / low-latency UI | Claude Fable 5 | Lower TTFT (340 ms). |
| Long-document RAG | Claude Fable 5 | Larger window (1M). |
| Screenshots / vision | Claude Fable 5 | Claude Fable 5 is the side marked multimodal in the catalog. |
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