feat(provider): add OpenCode Zen and OpenCode Go providers

Add support for OpenCode Zen (pay-as-you-go, 35+ curated models) and
OpenCode Go ($10/month subscription, open models) as first-class providers.

Both are OpenAI-compatible endpoints resolved via the generic api_key
provider flow — no custom adapter needed.

Files changed:
- hermes_cli/auth.py — ProviderConfig entries + aliases
- hermes_cli/config.py — OPENCODE_ZEN/GO API key env vars
- hermes_cli/models.py — model catalogs, labels, aliases, provider order
- hermes_cli/main.py — provider labels, menu entries, model flow dispatch
- hermes_cli/setup.py — setup wizard branches (idx 10, 11)
- agent/model_metadata.py — context lengths for all OpenCode models
- agent/auxiliary_client.py — default aux models
- .env.example — documentation

Co-authored-by: DevAgarwal2 <DevAgarwal2@users.noreply.github.com>

.env.example

@@ -45,6 +45,22 @@ MINIMAX_API_KEY=
 MINIMAX_CN_API_KEY=
 # MINIMAX_CN_BASE_URL=https://api.minimaxi.com/v1  # Override default base URL
 
+# =============================================================================
+# LLM PROVIDER (OpenCode Zen)
+# =============================================================================
+# OpenCode Zen provides curated, tested models (GPT, Claude, Gemini, MiniMax, GLM, Kimi)
+# Pay-as-you-go pricing. Get your key at: https://opencode.ai/auth
+OPENCODE_ZEN_API_KEY=
+# OPENCODE_ZEN_BASE_URL=https://opencode.ai/zen/v1  # Override default base URL
+
+# =============================================================================
+# LLM PROVIDER (OpenCode Go)
+# =============================================================================
+# OpenCode Go provides access to open models (GLM-5, Kimi K2.5, MiniMax M2.5)
+# $10/month subscription. Get your key at: https://opencode.ai/auth
+OPENCODE_GO_API_KEY=
+# OPENCODE_GO_BASE_URL=https://opencode.ai/zen/go/v1  # Override default base URL
+
 # =============================================================================
 # TOOL API KEYS
 # =============================================================================

agent/auxiliary_client.py

@@ -58,6 +58,8 @@ _API_KEY_PROVIDER_AUX_MODELS: Dict[str, str] = {
     "minimax-cn": "MiniMax-M2.5-highspeed",
     "anthropic": "claude-haiku-4-5-20251001",
     "ai-gateway": "google/gemini-3-flash",
+    "opencode-zen": "gemini-3-flash",
+    "opencode-go": "glm-5",
 }
 
 # OpenRouter app attribution headers

agent/model_metadata.py

@@ -80,6 +80,42 @@ DEFAULT_CONTEXT_LENGTHS = {
     "MiniMax-M2.5": 204800,
     "MiniMax-M2.5-highspeed": 204800,
     "MiniMax-M2.1": 204800,
+    # OpenCode Zen models
+    "gpt-5.4-pro": 128000,
+    "gpt-5.4": 128000,
+    "gpt-5.3-codex": 128000,
+    "gpt-5.3-codex-spark": 128000,
+    "gpt-5.2": 128000,
+    "gpt-5.2-codex": 128000,
+    "gpt-5.1": 128000,
+    "gpt-5.1-codex": 128000,
+    "gpt-5.1-codex-max": 128000,
+    "gpt-5.1-codex-mini": 128000,
+    "gpt-5": 128000,
+    "gpt-5-codex": 128000,
+    "gpt-5-nano": 128000,
+    "claude-opus-4-6": 200000,
+    "claude-opus-4-5": 200000,
+    "claude-opus-4-1": 200000,
+    "claude-sonnet-4-6": 200000,
+    "claude-sonnet-4-5": 200000,
+    "claude-sonnet-4": 200000,
+    "claude-haiku-4-5": 200000,
+    "claude-3-5-haiku": 200000,
+    "gemini-3.1-pro": 1048576,
+    "gemini-3-pro": 1048576,
+    "gemini-3-flash": 1048576,
+    "minimax-m2.5": 204800,
+    "minimax-m2.5-free": 204800,
+    "minimax-m2.1": 204800,
+    "glm-5": 202752,
+    "glm-4.7": 202752,
+    "glm-4.6": 202752,
+    "kimi-k2.5": 262144,
+    "kimi-k2-thinking": 262144,
+    "kimi-k2": 262144,
+    "qwen3-coder": 32768,
+    "big-pickle": 128000,
 }
 
 

hermes_cli/auth.py

@@ -163,6 +163,22 @@ PROVIDER_REGISTRY: Dict[str, ProviderConfig] = {
         api_key_env_vars=("AI_GATEWAY_API_KEY",),
         base_url_env_var="AI_GATEWAY_BASE_URL",
     ),
+    "opencode-zen": ProviderConfig(
+        id="opencode-zen",
+        name="OpenCode Zen",
+        auth_type="api_key",
+        inference_base_url="https://opencode.ai/zen/v1",
+        api_key_env_vars=("OPENCODE_ZEN_API_KEY",),
+        base_url_env_var="OPENCODE_ZEN_BASE_URL",
+    ),
+    "opencode-go": ProviderConfig(
+        id="opencode-go",
+        name="OpenCode Go",
+        auth_type="api_key",
+        inference_base_url="https://opencode.ai/zen/go/v1",
+        api_key_env_vars=("OPENCODE_GO_API_KEY",),
+        base_url_env_var="OPENCODE_GO_BASE_URL",
+    ),
 }
 
 
@@ -541,6 +557,8 @@ def resolve_provider(
         "minimax-china": "minimax-cn", "minimax_cn": "minimax-cn",
         "claude": "anthropic", "claude-code": "anthropic",
         "aigateway": "ai-gateway", "vercel": "ai-gateway", "vercel-ai-gateway": "ai-gateway",
+        "opencode": "opencode-zen", "zen": "opencode-zen",
+        "go": "opencode-go", "opencode-go-sub": "opencode-go",
     }
     normalized = _PROVIDER_ALIASES.get(normalized, normalized)
 

hermes_cli/config.py

@@ -485,6 +485,38 @@ OPTIONAL_ENV_VARS = {
         "password": False,
         "category": "provider",
     },
+    "OPENCODE_ZEN_API_KEY": {
+        "description": "OpenCode Zen API key (pay-as-you-go access to curated models)",
+        "prompt": "OpenCode Zen API key",
+        "url": "https://opencode.ai/auth",
+        "password": True,
+        "category": "provider",
+        "advanced": True,
+    },
+    "OPENCODE_ZEN_BASE_URL": {
+        "description": "OpenCode Zen base URL override",
+        "prompt": "OpenCode Zen base URL (leave empty for default)",
+        "url": None,
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
+    "OPENCODE_GO_API_KEY": {
+        "description": "OpenCode Go API key ($10/month subscription for open models)",
+        "prompt": "OpenCode Go API key",
+        "url": "https://opencode.ai/auth",
+        "password": True,
+        "category": "provider",
+        "advanced": True,
+    },
+    "OPENCODE_GO_BASE_URL": {
+        "description": "OpenCode Go base URL override",
+        "prompt": "OpenCode Go base URL (leave empty for default)",
+        "url": None,
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
 
     # ── Tool API keys ──
     "FIRECRAWL_API_KEY": {

hermes_cli/main.py

@@ -768,6 +768,8 @@ def cmd_model(args):
         "kimi-coding": "Kimi / Moonshot",
         "minimax": "MiniMax",
         "minimax-cn": "MiniMax (China)",
+        "opencode-zen": "OpenCode Zen",
+        "opencode-go": "OpenCode Go",
         "ai-gateway": "AI Gateway",
         "custom": "Custom endpoint",
     }
@@ -788,6 +790,8 @@ def cmd_model(args):
         ("kimi-coding", "Kimi / Moonshot (Moonshot AI direct API)"),
         ("minimax", "MiniMax (global direct API)"),
         ("minimax-cn", "MiniMax China (domestic direct API)"),
+        ("opencode-zen", "OpenCode Zen (35+ curated models, pay-as-you-go)"),
+        ("opencode-go", "OpenCode Go (open models, $10/month subscription)"),
         ("ai-gateway", "AI Gateway (Vercel — 200+ models, pay-per-use)"),
     ]
 
@@ -857,7 +861,7 @@ def cmd_model(args):
         _model_flow_anthropic(config, current_model)
     elif selected_provider == "kimi-coding":
         _model_flow_kimi(config, current_model)
-    elif selected_provider in ("zai", "minimax", "minimax-cn", "ai-gateway"):
+    elif selected_provider in ("zai", "minimax", "minimax-cn", "opencode-zen", "opencode-go", "ai-gateway"):
         _model_flow_api_key_provider(config, selected_provider, current_model)
 
 

hermes_cli/models.py

@@ -83,6 +83,48 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "deepseek-chat",
         "deepseek-reasoner",
     ],
+    "opencode-zen": [
+        "gpt-5.4-pro",
+        "gpt-5.4",
+        "gpt-5.3-codex",
+        "gpt-5.3-codex-spark",
+        "gpt-5.2",
+        "gpt-5.2-codex",
+        "gpt-5.1",
+        "gpt-5.1-codex",
+        "gpt-5.1-codex-max",
+        "gpt-5.1-codex-mini",
+        "gpt-5",
+        "gpt-5-codex",
+        "gpt-5-nano",
+        "claude-opus-4-6",
+        "claude-opus-4-5",
+        "claude-opus-4-1",
+        "claude-sonnet-4-6",
+        "claude-sonnet-4-5",
+        "claude-sonnet-4",
+        "claude-haiku-4-5",
+        "claude-3-5-haiku",
+        "gemini-3.1-pro",
+        "gemini-3-pro",
+        "gemini-3-flash",
+        "minimax-m2.5",
+        "minimax-m2.5-free",
+        "minimax-m2.1",
+        "glm-5",
+        "glm-4.7",
+        "glm-4.6",
+        "kimi-k2.5",
+        "kimi-k2-thinking",
+        "kimi-k2",
+        "qwen3-coder",
+        "big-pickle",
+    ],
+    "opencode-go": [
+        "glm-5",
+        "kimi-k2.5",
+        "minimax-m2.5",
+    ],
     "ai-gateway": [
         "anthropic/claude-opus-4.6",
         "anthropic/claude-sonnet-4.6",
@@ -109,6 +151,8 @@ _PROVIDER_LABELS = {
     "minimax-cn": "MiniMax (China)",
     "anthropic": "Anthropic",
     "deepseek": "DeepSeek",
+    "opencode-zen": "OpenCode Zen",
+    "opencode-go": "OpenCode Go",
     "ai-gateway": "AI Gateway",
     "custom": "Custom endpoint",
 }
@@ -125,6 +169,10 @@ _PROVIDER_ALIASES = {
     "claude": "anthropic",
     "claude-code": "anthropic",
     "deep-seek": "deepseek",
+    "opencode": "opencode-zen",
+    "zen": "opencode-zen",
+    "go": "opencode-go",
+    "opencode-go-sub": "opencode-go",
     "aigateway": "ai-gateway",
     "vercel": "ai-gateway",
     "vercel-ai-gateway": "ai-gateway",
@@ -162,6 +210,7 @@ def list_available_providers() -> list[dict[str, str]]:
     _PROVIDER_ORDER = [
         "openrouter", "nous", "openai-codex",
         "zai", "kimi-coding", "minimax", "minimax-cn", "anthropic",
+        "opencode-zen", "opencode-go",
         "ai-gateway", "deepseek", "custom",
     ]
     # Build reverse alias map

hermes_cli/setup.py

@@ -726,6 +726,8 @@ def setup_model_provider(config: dict):
         "MiniMax China (mainland China endpoint)",
         "Anthropic (Claude models — API key or Claude Code subscription)",
         "AI Gateway (Vercel — 200+ models, pay-per-use)",
+        "OpenCode Zen (35+ curated models, pay-as-you-go)",
+        "OpenCode Go (open models, $10/month subscription)",
     ]
     if keep_label:
         provider_choices.append(keep_label)
@@ -1266,7 +1268,73 @@ def setup_model_provider(config: dict):
         _update_config_for_provider("ai-gateway", pconfig.inference_base_url, default_model="anthropic/claude-opus-4.6")
         _set_model_provider(config, "ai-gateway", pconfig.inference_base_url)
 
-    # else: provider_idx == 10 (Keep current) — only shown when a provider already exists
+    elif provider_idx == 10:  # OpenCode Zen
+        selected_provider = "opencode-zen"
+        print()
+        print_header("OpenCode Zen API Key")
+        pconfig = PROVIDER_REGISTRY["opencode-zen"]
+        print_info(f"Provider: {pconfig.name}")
+        print_info(f"Base URL: {pconfig.inference_base_url}")
+        print_info("Get your API key at: https://opencode.ai/auth")
+        print()
+
+        existing_key = get_env_value("OPENCODE_ZEN_API_KEY")
+        if existing_key:
+            print_info(f"Current: {existing_key[:8]}... (configured)")
+            if prompt_yes_no("Update API key?", False):
+                api_key = prompt_text("OpenCode Zen API key", password=True)
+                if api_key:
+                    save_env_value("OPENCODE_ZEN_API_KEY", api_key)
+                    print_success("OpenCode Zen API key updated")
+        else:
+            api_key = prompt_text("OpenCode Zen API key", password=True)
+            if api_key:
+                save_env_value("OPENCODE_ZEN_API_KEY", api_key)
+                print_success("OpenCode Zen API key saved")
+            else:
+                print_warning("Skipped - agent won't work without an API key")
+
+        # Clear custom endpoint vars if switching
+        if existing_custom:
+            save_env_value("OPENAI_BASE_URL", "")
+            save_env_value("OPENAI_API_KEY", "")
+        _set_model_provider(config, "opencode-zen", pconfig.inference_base_url)
+        selected_base_url = pconfig.inference_base_url
+
+    elif provider_idx == 11:  # OpenCode Go
+        selected_provider = "opencode-go"
+        print()
+        print_header("OpenCode Go API Key")
+        pconfig = PROVIDER_REGISTRY["opencode-go"]
+        print_info(f"Provider: {pconfig.name}")
+        print_info(f"Base URL: {pconfig.inference_base_url}")
+        print_info("Get your API key at: https://opencode.ai/auth")
+        print()
+
+        existing_key = get_env_value("OPENCODE_GO_API_KEY")
+        if existing_key:
+            print_info(f"Current: {existing_key[:8]}... (configured)")
+            if prompt_yes_no("Update API key?", False):
+                api_key = prompt_text("OpenCode Go API key", password=True)
+                if api_key:
+                    save_env_value("OPENCODE_GO_API_KEY", api_key)
+                    print_success("OpenCode Go API key updated")
+        else:
+            api_key = prompt_text("OpenCode Go API key", password=True)
+            if api_key:
+                save_env_value("OPENCODE_GO_API_KEY", api_key)
+                print_success("OpenCode Go API key saved")
+            else:
+                print_warning("Skipped - agent won't work without an API key")
+
+        # Clear custom endpoint vars if switching
+        if existing_custom:
+            save_env_value("OPENAI_BASE_URL", "")
+            save_env_value("OPENAI_API_KEY", "")
+        _set_model_provider(config, "opencode-go", pconfig.inference_base_url)
+        selected_base_url = pconfig.inference_base_url
+
+    # else: provider_idx == 12 (Keep current) — only shown when a provider already exists
     # Normalize "keep current" to an explicit provider so downstream logic
     # doesn't fall back to the generic OpenRouter/static-model path.
     if selected_provider is None: