Token-wise decisions for AI APIs. Troubleshoot errors, understand rate limits, compare pricing, and migrate between OpenAI, Anthropic, Google, Mistral, and DeepSeek.https://tokenswise.com/en-ushttps://tokenswise.com/migrations/anthropic-to-deepseek/https://tokenswise.com/migrations/anthropic-to-deepseek/Migrate Anthropic Claude to DeepSeek — remap the Messages API to DeepSeek's OpenAI-compatible chat API: system prompt, response shape, and tools.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/anthropic-to-google/https://tokenswise.com/migrations/anthropic-to-google/Migrate Anthropic Claude to Google Gemini — map the Messages API to the google-genai SDK: roles, system instruction, response shape, and tools.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/anthropic-to-openai/https://tokenswise.com/migrations/anthropic-to-openai/Migrate from Anthropic Claude to OpenAI — map the Messages API to Chat Completions: system prompt, max_tokens, response shape, and tools. Before/after code.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/deepseek-to-anthropic/https://tokenswise.com/migrations/deepseek-to-anthropic/Migrate DeepSeek to Anthropic Claude — map the OpenAI-compatible chat API to the Messages API: system prompt, required max_tokens, response shape, tools.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/deepseek-to-google/https://tokenswise.com/migrations/deepseek-to-google/Migrate from DeepSeek to Google Gemini — keep the OpenAI SDK via Gemini's compatibility endpoint, or port to the native google-genai SDK. Before/after code.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/deepseek-to-openai/https://tokenswise.com/migrations/deepseek-to-openai/Migrate DeepSeek to OpenAI — reverse the OpenAI-compatible setup: drop the base URL, swap key and model, handle reasoner output. Before/after code.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/google-to-anthropic/https://tokenswise.com/migrations/google-to-anthropic/Migrate Google Gemini to Anthropic Claude — map the google-genai SDK to the Messages API: roles, system prompt, required max_tokens, and tools.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/google-to-deepseek/https://tokenswise.com/migrations/google-to-deepseek/Migrate from Google Gemini to DeepSeek — remap the google-genai SDK to DeepSeek's OpenAI-compatible chat API: contents→messages, system prompt, response shape.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/google-to-openai/https://tokenswise.com/migrations/google-to-openai/Migrate Google Gemini to OpenAI — map the google-genai SDK to Chat Completions: contents to messages, system prompt, response shape, and tools.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/openai-to-deepseek/https://tokenswise.com/migrations/openai-to-deepseek/Migrate OpenAI to DeepSeek — a near drop-in switch via DeepSeek's OpenAI-compatible API: change base URL, key, and model. Before/after code and gotchas.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/migrations/openai-to-google/https://tokenswise.com/migrations/openai-to-google/Migrate from OpenAI to Google Gemini — the quick OpenAI-compatible path or the native google-genai SDK. API mapping, before/after code, and gotchas.Sun, 07 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/errors/openai/429-rate-limit-exceeded/https://tokenswise.com/errors/openai/429-rate-limit-exceeded/Fix OpenAI 429 rate limit errors fast: causes, exponential backoff in Python/JS/cURL, throttling, tier upgrades, and prevention. Working code, no fluff.Sat, 06 Jun 2026 00:00:00 GMTerrorshttps://tokenswise.com/deprecations/openai-gpt-3-5-turbo-0301/https://tokenswise.com/deprecations/openai-gpt-3-5-turbo-0301/OpenAI's gpt-3.5-turbo-0301 snapshot is deprecated. Sunset date, recommended replacement, what changes, and how to migrate pinned model strings safely.Fri, 05 Jun 2026 00:00:00 GMTdeprecationshttps://tokenswise.com/migrations/openai-to-anthropic/https://tokenswise.com/migrations/openai-to-anthropic/Migrate from OpenAI to Anthropic Claude: API mapping for messages, system prompts, max_tokens, and tool calling, with before/after code and a rollout checklist.Thu, 04 Jun 2026 00:00:00 GMTmigrationshttps://tokenswise.com/pricing/openai-vs-anthropic/https://tokenswise.com/pricing/openai-vs-anthropic/OpenAI vs Anthropic pricing compared for developers: per-token input/output rates, caching and batch discounts, and worked cost examples for real workloads.Wed, 03 Jun 2026 00:00:00 GMTpricinghttps://tokenswise.com/rate-limits/anthropic-claude/https://tokenswise.com/rate-limits/anthropic-claude/Anthropic Claude rate limits reference: requests, input tokens, and output tokens per minute, usage tiers, the rate-limit headers, and handling 429 vs 529.Tue, 02 Jun 2026 00:00:00 GMTrate-limitshttps://tokenswise.com/rate-limits/openai/https://tokenswise.com/rate-limits/openai/OpenAI rate limits reference: how RPM and TPM work, the usage-tier table, the response headers that show your headroom, and how to engineer around the limits.Mon, 01 Jun 2026 00:00:00 GMTrate-limitshttps://tokenswise.com/errors/anthropic/529-overloaded/https://tokenswise.com/errors/anthropic/529-overloaded/Fix Anthropic Claude 529 Overloaded errors: what it means vs a 429, how to back off with jitter, and add provider failover. Python and JS code.Thu, 28 May 2026 00:00:00 GMTerrorshttps://tokenswise.com/errors/openai/401-invalid-authentication/https://tokenswise.com/errors/openai/401-invalid-authentication/Fix OpenAI 401 invalid authentication errors: bad or revoked API keys, wrong org/project headers, and env-var mistakes. Working checks in Python, JS, and cURL.Wed, 20 May 2026 00:00:00 GMTerrors