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Claude Sonnet 5.5

Anthropic · The balanced default for builders.

Sonnet 5 is the pragmatic center of the Claude line: near-Opus coding with 1M context at mainstream pricing — the model most products should start with.

Live OpenRouter pricing · capability ratings & benchmarks are indicative

Context window

1M

tokens

Input · $/1M

$2.00

per million tokens

Output · $/1M

$10.00

per million tokens

Vs. cost floor

57×

output cost vs DeepSeek V4.1 Flash

Capability profile

Editorial ratings across six axes (0–100), compiled from publisher reports and public evals — indicative, not measured by TrendNexus.

Benchmark highs

SWE-bench Verified≈78%

excellent engineering

Terminal-Bench≈55%

capable autonomy

MMLU-Pro≈85%

broad competence

IFEval≈93%

instruction following

Where it sits in the field

Output cost per million tokens across all 15 tracked flagships — Claude Sonnet 5.5 highlighted.

Claude Fable 5.1$50.00GPT-5.5$30.00Claude Opus 5.5$20.00GPT-5.6 Terra Pro$12.00Gemini 3.1 Pro Preview$12.00GPT-6.1 Sol Pro$10.00Claude Sonnet 5.5$10.00Kimi K3$10.00GLM 5.3 Prime$8.80Grok 4.7$6.00Qwen3 Max$6.00Gemini 3.8 Flash$3.75DeepSeek V4 Pro 0423$0.879Llama 4 Maverick$0.652DeepSeek V4.1 Flash$0.175

What it's suited to build

Product classes where this model's profile wins — mockups are illustrative, not model output.

Coding

Developer-tool backends

The engine behind coding assistants and review pipelines.

Product AI

Full-stack product AI

One model covering chat, extraction and generation well.

Agents

Production agent fleets

Reliable workers with strong tool use at scale.

Benchmark figures and capability ratings are indicative — compiled from publisher reports and public leaderboards, refreshed editorially, and not independently measured by TrendNexus. Verify against your own evals before procurement decisions. Pricing updates with the daily build.