LLM7 model guide

gpt-5.5 alternatives

Compare active chat alternatives to gpt-5.5, including capabilities, context, pricing, and API changes.

Alternatives to gpt-5.5

The original model is active. Ranking uses shared reported capabilities and modalities, then the closest known context window, then model ID. Unknown context differences sort last. Similar metadata does not establish equivalent output quality.

Original pricing: $0.20 USD input and $1.00 USD output per 1M tokens. Original context: 1,050,000 tokens.

claude-fable-5-1

Matching features: Tool calling, Vision, Long context, JSON mode, Streaming, Reasoning, text input, image input, text output.

Original features not confirmed on this alternative: None. Missing reports are unknown, not confirmed losses.

Context: 1050000 → 1000000 tokens (-50000).

$4.00 USD input and $15.00 USD output per 1M tokens. Prices use the same billing mode, currency, and unit; compare the rates above.

Change the request model ID from gpt-5.5 to claude-fable-5-1.

Original interfaces: POST /v1/chat/completions. Alternative interfaces: POST /v1/chat/completions, POST /v1/messages. Adjust the endpoint and request body to the selected interface.

Original request

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A verified request for this exact model. Add your API key and run it.

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curl https://api.llm7.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM7_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

Alternative request

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A verified request for this exact model. Add your API key and run it.

Read the docs

curl https://api.llm7.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM7_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-fable-5-1",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

Compare gpt-5.5 and claude-fable-5-1

claude-opus-4-8

Matching features: Tool calling, Vision, Long context, JSON mode, Streaming, Reasoning, text input, image input, text output.

Original features not confirmed on this alternative: None. Missing reports are unknown, not confirmed losses.

Context: 1050000 → 1000000 tokens (-50000).

$2.25 USD input and $12.19 USD output per 1M tokens. Prices use the same billing mode, currency, and unit; compare the rates above.

Change the request model ID from gpt-5.5 to claude-opus-4-8.

Original interfaces: POST /v1/chat/completions. Alternative interfaces: POST /v1/chat/completions, POST /v1/messages. Adjust the endpoint and request body to the selected interface.

Original request

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A verified request for this exact model. Add your API key and run it.

Read the docs

curl https://api.llm7.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM7_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

Alternative request

Start building

A verified request for this exact model. Add your API key and run it.

Read the docs

curl https://api.llm7.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM7_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-opus-4-8",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

Compare gpt-5.5 and claude-opus-4-8

claude-opus-5

Matching features: Tool calling, Vision, Long context, JSON mode, Streaming, Reasoning, text input, image input, text output.

Original features not confirmed on this alternative: None. Missing reports are unknown, not confirmed losses.

Context: 1050000 → 1000000 tokens (-50000).

$2.50 USD input and $12.50 USD output per 1M tokens. Prices use the same billing mode, currency, and unit; compare the rates above.

Change the request model ID from gpt-5.5 to claude-opus-5.

Original interfaces: POST /v1/chat/completions. Alternative interfaces: POST /v1/chat/completions, POST /v1/messages. Adjust the endpoint and request body to the selected interface.

Original request

Start building

A verified request for this exact model. Add your API key and run it.

Read the docs

curl https://api.llm7.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM7_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

Alternative request

Start building

A verified request for this exact model. Add your API key and run it.

Read the docs

curl https://api.llm7.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM7_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-opus-5",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

Compare gpt-5.5 and claude-opus-5

claude-sonnet-4-6

Matching features: Tool calling, Vision, Long context, JSON mode, Streaming, Reasoning, text input, image input, text output.

Original features not confirmed on this alternative: None. Missing reports are unknown, not confirmed losses.

Context: 1050000 → 1000000 tokens (-50000).

$0.12 USD input and $0.45 USD output per 1M tokens. Prices use the same billing mode, currency, and unit; compare the rates above.

Change the request model ID from gpt-5.5 to claude-sonnet-4-6.

Original interfaces: POST /v1/chat/completions. Alternative interfaces: POST /v1/chat/completions, POST /v1/messages. Adjust the endpoint and request body to the selected interface.

Original request

Start building

A verified request for this exact model. Add your API key and run it.

Read the docs

curl https://api.llm7.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM7_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

Alternative request

Start building

A verified request for this exact model. Add your API key and run it.

Read the docs

curl https://api.llm7.io/v1/chat/completions \
  -H "Authorization: Bearer $LLM7_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'

Compare gpt-5.5 and claude-sonnet-4-6

gpt-5.6-sol

Matching features: Tool calling, Vision, Long context, JSON mode, Streaming, Reasoning, text input, image input, text output.

Original features not confirmed on this alternative: None. Missing reports are unknown, not confirmed losses.

Context: 1050000 → 1000000 tokens (-50000).

$1.92 USD input and $5.40 USD output per 1M tokens. Prices use the same billing mode, currency, and unit; compare the rates above.

Change the request model ID from gpt-5.5 to gpt-5.6-sol.

Original interfaces: POST /v1/chat/completions. Alternative interfaces: POST /v1/chat/completions. The published API interfaces are unchanged.

Compare gpt-5.5 and gpt-5.6-sol

gpt-5.6-terra

Matching features: Tool calling, Vision, Long context, JSON mode, Streaming, Reasoning, text input, image input, text output.

Original features not confirmed on this alternative: None. Missing reports are unknown, not confirmed losses.

Context: 1050000 → 1000000 tokens (-50000).

$0.24 USD input and $1.00 USD output per 1M tokens. Prices use the same billing mode, currency, and unit; compare the rates above.

Change the request model ID from gpt-5.5 to gpt-5.6-terra.

Original interfaces: POST /v1/chat/completions. Alternative interfaces: POST /v1/chat/completions. The published API interfaces are unchanged.

Compare gpt-5.5 and gpt-5.6-terra

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