2026-07-06T00:00:00.000ZVS CodeFor builders

How Prompt Tuning Improved GPT-5.5 in VS Code

See how VS Code and OpenAI tested GPT-5.5 system prompt changes in a two-week experiment, cutting tool calls and tail-end token usage while speeding up edits.

Why it matters

VS Code published a model update. If you use a hosted chat, read the source before you assume your usual model changed.

What you can do

GPT-5.5 is on the cloud board. List cost is $5 in and $30 out per million tokens.

For builders

Try GPT-5.5. Copy the OpenRouter call.

Copy

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

Open the source

See GPT-5.5 Plan a job from this

How Prompt Tuning Improved GPT-5.5 in VS Code

Updated just now

See how VS Code and OpenAI tested GPT-5.5 system prompt changes in a two-week experiment, cutting tool calls and tail-end token usage while speeding up edits.

Why it matters

VS Code published a model update. If you use a hosted chat, read the source before you assume your usual model changed.

What you can do

GPT-5.5 is on the cloud board. List cost is $5 in and $30 out per million tokens.

For builders

Try GPT-5.5. Copy the OpenRouter call.

Copy

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

Open the source

See GPT-5.5 Plan a job from this

How Prompt Tuning Improved GPT-5.5 in VS Code

Why it matters

What you can do

For builders

Copy

Tags

How Prompt Tuning Improved GPT-5.5 in VS Code

Why it matters

What you can do

For builders

Copy

Tags