Model error diagnosis

Anthropic: Claude Sonnet 4 | context length exceeded

Anthropic: Claude Sonnet 4 returning 400 / context length exceeded means you should first confirm whether model ID anthropic/claude-sonnet-4 is visible for this Anthropic key, then separate permission, context, capability, rate limit, or route issues.

Model

anthropic/claude-sonnet-4

Anthropic: Claude Sonnet 4

Provider

Anthropic

13 models in catalog

Error type

context length exceeded

context-exceeded

Status code

400

global model route

Model error summary

Model

anthropic/claude-sonnet-4

Error type

context-exceeded

Status code

400

Read-only check. Detection data burns after 5 minutes.

What this model error usually means

Anthropic: Claude Sonnet 4 returning 400 / context length exceeded means you should first confirm whether model ID anthropic/claude-sonnet-4 is visible for this Anthropic key, then separate permission, context, capability, rate limit, or route issues.

Model: anthropic/claude-sonnet-4
Provider: Anthropic
Status code: 400

How to prove it during checking

Read-only check. Detection data burns after 5 minutes.

List models: confirm whether anthropic/claude-sonnet-4 is actually visible instead of guessing from the display name.
Light probe: use minimal input to verify whether Anthropic returns the same 400, then record the error body.
Compare model facts: context 1,000,000, input $3, output $15.
supports include_reasoning
supports max_tokens
supports reasoning
supports stop

Next action

Anthropic: Claude Sonnet 4 context length exceeded should not end at failed. Return the next move: change model ID, add permission, reduce context, disable unsupported capability, change route, monitor, or hold listing.

Context: 1,000,000
Price: $3 / $15
Read-only check. Detection data burns after 5 minutes.

Open key checker

Read-only check. Detection data burns after 5 minutes.

Open models

Anthropic: Claude Sonnet 4

Open providers

Anthropic