ChatGPT Plus or Claude Pro? Coding and Cost Compared

Consumer subscriptions determine access inside the apps, while API workloads are billed by tokens under different rate cards. GPT-5.6 Sol currently has the lower uncached API price, even though Claude Fable 5 has the stronger result on the directly comparable coding benchmark.

The comparison makes clear that the entry subscription is not an unlimited agent plan. ChatGPT Plus includes GPT-5.6 Sol with Medium and High reasoning, but excludes Extra High and Sol Pro.

What Happened

OpenAI’s availability and limits table lists Sol, Terra and Luna for Plus in Work and Codex; it also notes that Sol is rolling out gradually and that reaching a reasoning limit may trigger another available reasoning model. The equal sticker price therefore.

• Anthropic’s individual-plan comparison prices Claude Pro at $20 per month or $200 per year.

• It describes Pro capacity as standard, while Max 5x costs $100 monthly and Max 20x costs $200, providing five and twenty times Pro capacity per session respectively.

• The BenchLM dataset verified on August 27, 2026 gives Claude Fable 5 an overall public score of 83.01, compared with 82.04 for GPT-5.6 Sol.

Key Details

Neither provider promises a fixed number of completed patches, research jobs or agent runs in the plan information used here. Buyers expecting sustained autonomous work should treat model access and usable session capacity as separate criteria.

• The official GPT-5.6 Sol model card lists promotional rates of $4 per million input tokens and $20 per million output tokens, available at least through November 21, 2026.

• Requests exceeding 272,000 input tokens are charged at twice the input rate and 1.5 times the output rate for the full request.

• Anthropic’s Fable 5 pricing is $10 per million input tokens and $50 per million output tokens, with a 90% input-token discount for prompt-cache hits.

Why It Matters

Fable scores 95 on SWE-bench Verified and leads the shared SWE-bench Pro result by 80 to 64.6; Sol leads Terminal-Bench 2 by 91.9 to 84.3. BenchLM labels Sol’s public ranking Estimated, so the composite-score gap should not be treated as decisive.

• For a hypothetical uncached workload containing one million input and one million output tokens, those confirmed rates produce totals of $24 for Sol and $60 for Fable.

• ChatGPT Plus is the more versatile $20 choice for mixed tool use, terminal work and research.

What Reports Say

Coverage of the story so far points to:

• Continued reporting by quasa.io as more details emerge