Claude

Anthropic: Claude Sonnet 5

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Claude Sonnet 5 is Anthropic's flagship Sonnet-series model released on 2026-07-01, featuring a 1M-token context window and 128K output. It supports adaptive thinking (extended reasoning), vision, tool use, prompt caching, and web search. Available via both OpenAI-compatible and native Anthropic protocols through Ofox.

Context Window
1M
Max Output Tokens
128K
Released
2026-07-01
Capabilities
VisionFunction CallingReasoningPrompt CachingPDF Input
Available Providers
BedrockBedrockAnthropicAnthropic
Supported Protocols
OpenAIopenaiAnthropicanthropic

Providers

AnthropicAnthropic
Input Tokens
$2/M
Output Tokens
$10/M
Cache Read
$0.2/M
Cache Write (5 min)
$2.5/M
Cache Write (1 hour)
$4/M
Web Search
$0.015/R
Protocols
Anthropicanthropic
BedrockBedrock
Input Tokens
$2/M
Output Tokens
$10/M
Cache Read
$0.2/M
Cache Write (5 min)
$2.5/M
Cache Write (1 hour)
$4/M
Web Search
$0.015/R
Protocols
OpenAIopenai/v1/chat/completions/v1/responses
Anthropicanthropic
AzureAzure
Input Tokens
$2/M
Output Tokens
$10/M
Cache Read
$0.2/M
Cache Write (5 min)
$2.5/M
Cache Write (1 hour)
$4/M
Web Search
$0.015/R
Protocols
Anthropicanthropic

Code Examples

import anthropic


client = anthropic.Anthropic(
    base_url="https://api.ofox.run/anthropic",
    api_key="YOUR_OFOX_API_KEY",
)


message = client.messages.create(
    model="anthropic/claude-sonnet-5",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Hello!"}
    ],
)


print(message.content[0].text)

Uptime & Status

Benchmarks

LMArena ↗Evaluated as claude-sonnet-5-high

Anthropic: Claude Sonnet 5 scores 1463 in the Overall category of the LMArena text leaderboard (style control), ranking #36 of 374 models based on 9,850 human preference votes (updated 2026-07-12).

Benchmark scores for claude-sonnet-5-high on LMArena
CategoryArena Score95% CIRankVotes
Overall14631456–1470#36 of 3749,850
Hard Prompts14931485–1501#23 of 3746,491
Coding15221510–1534#15 of 3692,725
Math14631436–1490#36 of 362449
Creative Writing14301416–1445#48 of 3721,699
Instruction Following14651454–1476#22 of 3743,269
Chinese15091482–1535#23 of 344499

Source: LMArena · CC BY 4.0 · Updated 2026-07-12 · Methodology ↗ · Ranks compare models within each category of the LMArena text leaderboard (style control). Scores come from third-party human preference evaluations, not from OFOX.

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Frequently Asked Questions

Anthropic: Claude Sonnet 5 on Ofox.ai costs $2/M per million input tokens and $10/M per million output tokens. Pay-as-you-go, no monthly fees.