Users can call Anthropic's Claude Fable 5 today and OpenAI's GPT-5.6 Sol, Terra, and Luna as soon as the family reaches general availability with no OpenAI or Anthropic subscription and zero markup.

SINGAPORE, July 04, 2026 (EZ Newswire) -- MixRoute, the unified API gateway for large language models, today confirmed that it will offer OpenAI's GPT-5.6 model family as soon as the models reach general availability. GPT-5.6 will join Anthropic's Claude Fable 5, which is already live on the platform. The result gives developers access to both frontier systems through a single API key and a single top-up, without a separate OpenAI or Anthropic subscription.

OpenAI previewed the GPT-5.6 family on June 26, 2026, opening access to a limited group of partner organizations ahead of a wider public release expected in the coming weeks. The family includes three modes: Sol, the flagship model built for the hardest problems; Terra, a balanced option for high-volume business tasks; and Luna, a faster, lower-cost model for everyday work. Of the three, Sol is the mode positioned to compete most directly with Anthropic's most capable models.

Independent benchmark reporting suggests the two systems trade wins rather than one clearly leading. GPT-5.6 Sol has topped Terminal-Bench 2.1 in published results, while Claude Fable 5 has held the lead on SWE-Bench Pro. According to those comparisons, each model is stronger on different classes of work. For teams, the practical takeaway is that access to both models, rather than a single provider, offers the widest coverage.

MixRoute is built for exactly that scenario. A single top-up unlocks both models plus more than 200 others, available around the clock at official provider pricing with zero markup. Teams no longer need to maintain and pay for separate OpenAI and Anthropic accounts to work across the two ecosystems.

"The frontier is no longer a single model from a single lab," said Alan Lu at MixRoute. "Sol and Fable 5 are each better at different things, so forcing developers to pick one provider means leaving capability on the table. MixRoute exists so teams can reach the right model for each task without juggling subscriptions or paying a markup to do it."

Claude Fable 5 is available on the platform today. GPT-5.6 will be added once OpenAI opens the models to the public, at which point existing MixRoute users will be able to call both through the same endpoint they already use.

About MixRoute

MixRoute is a unified API gateway that gives developers access to more than 200 AI models through a single API key and one OpenAI-compatible endpoint. The platform charges official provider pricing with zero markup, so teams can call frontier models from OpenAI, Anthropic, and others without separate subscriptions or per-provider accounts. Reserved capacity helps reduce rate-limit errors, and consolidated billing replaces multiple invoices with a single top-up. Learn more at mixroute.ai.

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