Setting provider.<id>.options.baseURL changes which model opencode picks by default #54686

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1. opencode-agent commented on Oct 12, 2026

   

   opencode-agentBot

   on Oct 12, 2026 – with OpenCode Agent

   Contributor

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   Thanks for the very precise report. I reproduced this with your two configs and the same isolated setup (env -i, fresh HOME and project dir, only OPENAI_API_KEY=probe-openai, no model selected).

   • 2.0.26: config A selects openai|gpt-6.1-sol and fails with the invalid-key 401. Config B, which only adds providers.anthropic.settings.baseURL, selects anthropic|claude-haiku-5-5 and fails with ConnectionRefused. Both results come from the persisted assistant messages.
   • Latest dev (4d9678a): same result.

   The script below runs both cases and prints the persisted provider/model for each.

   As you point out, the config provider transform marks every configured provider as enabled, even a settings-only one, and enabled providers count as available without a credential. Related: #47815 (the same report against v1) and #42790 (credential-less configured providers).

   Reproduction script (repro.sh)

   #!/usr/bin/env bash
   # Reproduces #54686: an endpoint-only provider overlay changes the implicit default model.
   # Usage: ./repro.sh            (uses `opencode` from PATH)
   #        OC_DEV=/path/to/repo ./repro.sh   (runs from source checkout)
   set -u
   here="$(cd "$(dirname "$0")" && pwd)"
   cat > "$here/a.json" <<'J'
   { "experimental": { "policies": [ { "action": "provider.use", "resource": "opencode", "effect": "deny" } ] } }
   J
   cat > "$here/b.json" <<'J'
   { "experimental": { "policies": [ { "action": "provider.use", "resource": "opencode", "effect": "deny" } ] },
     "providers": { "anthropic": { "settings": { "baseURL": "http://127.0.0.1:8899/anthropic/v1" } } } }
   J
   if [ -n "${OC_DEV:-}" ]; then
     run=(bun --conditions=browser --preload="$OC_DEV/packages/tui/node_modules/@opentui/solid/scripts/preload.js" "$OC_DEV/packages/cli/src/index.ts")
   else
     run=("$(command -v opencode)")
   fi
   "${run[@]}" --version
   scratch="$(mktemp -d)"
   for c in a b; do
     mkdir -p "$scratch/$c/home" "$scratch/$c/project"
     echo "=== case $c ==="
     envs=(env -i PATH="$PATH" HOME="$scratch/$c/home" OPENAI_API_KEY=probe-openai OPENCODE_CONFIG="$here/$c.json")
     if [ -n "${OC_DEV:-}" ]; then
       # From source, --standalone cannot spawn its child server (it drops the bun preload),
       # so start an equally isolated server ourselves and attach to it.
       port=$((20000 + RANDOM % 20000))
       ( cd "$scratch/$c/project" && OPENCODE_PASSWORD=probe "${envs[@]}" OPENCODE_PASSWORD=probe "${run[@]}" serve --port "$port" >"$scratch/$c/serve.log" 2>&1 ) &
       spid=$!
       for _ in $(seq 60); do curl -s -o /dev/null "http://127.0.0.1:$port" && break; sleep 1; done
       ( cd "$scratch/$c/project" && "${envs[@]}" OPENCODE_PASSWORD=probe timeout 90 "${run[@]}" run --server "http://127.0.0.1:$port" 'say hi' 2>&1 | uniq | tail -n 8 )
       pkill -P "$spid" 2>/dev/null; kill "$spid" 2>/dev/null; sleep 1
     else
       ( cd "$scratch/$c/project" && "${envs[@]}" timeout 90 "${run[@]}" run --standalone 'say hi' 2>&1 | uniq | tail -n 8 )
     fi
     db="$(find "$scratch/$c/home" -name "opencode*.db" | head -1)"
     echo "--- persisted assistant model ($db):"
     [ -n "$db" ] && DB="$db" bun -e 'import {Database} from "bun:sqlite"; const d=new Database(process.env.DB,{readonly:true}); console.log([...new Set(d.query("SELECT json_extract(data,\"$.model.providerID\")||\"|\"||json_extract(data,\"$.model.id\") AS m FROM session_message WHERE type=\"assistant\"").all().map(r=>r.m))].join("\n"))'
   done

   Run it: bash repro.sh
2. opencode-agent

   added

   reproduced

   on Oct 12, 2026