GPT-5.6 Sol vs Claude Opus 5 (2026): Public Challenger vs Anthropic's New Frontier Default
GPT-5.6 Sol vs Claude Opus 5 in 2026: pricing, Sol/Terra/Luna tiers, coding benchmarks, safety claims and when to route work to each model.
Opus 5 arrived with a bigger coding jump than the prior Opus 4.8 baseline had: SWE-bench Verified rose from 88.6% to 96%, a 7.4-point gain at an unchanged price, and Opus 5 more than doubled Opus 4.8's Frontier-Bench v0.1 score while topping every competing model including Fable 5. GPT-5.6 Sol still brings real, differentiated strengths — OpenAI's own Terminal-Bench 2.1 state-of-the-art claim, ExploitBench results competitive with Mythos Preview at roughly a third of the output tokens, and the Sol/Terra/Luna tiering for clean cost routing ($5/$30, $2.50/$15, $1/$6). Neither wins outright: route high-ambition terminal-agent and security workloads to GPT-5.6 Sol, or cost-optimize with Terra/Luna; lean on Claude Opus 5 for the highest available coding ceiling, computer-use execution, and Anthropic's own safety-audit findings around deception resistance. With Opus 5 only days old and GPT-5.6 Sol's independent benchmark replication still arriving, run your own evals before committing either model to production-critical paths.
Detailed Comparison
A side-by-side analysis of key factors to help you make the right choice.
| Factor | GPT-5.6 SolRecommended | Claude Opus 5 | Winner |
|---|---|---|---|
| Availability today | Publicly available since July 9, 2026: full OpenAI API plus ChatGPT Plus/Pro, all three tiers, after US regulatory clearance | Publicly available since July 24, 2026 across the Claude API, Bedrock, Google Cloud, Microsoft Foundry, claude.ai, Claude Code, and Cowork | |
| Coding ceiling | OpenAI claims a Terminal-Bench 2.1 state of the art with max reasoning and ultra subagent mode, independently testable since GA | 96% on SWE-bench Verified at launch — a 7.4-point jump over Opus 4.8's 88.6%, the largest single-generation coding gain on this page | |
| Frontier reasoning and computer-use | No published Frontier-Bench or OSWorld 2.0 results; strongest published claims remain terminal-agent and cyber-focused | 43.3% on Frontier-Bench v0.1 (more than double Opus 4.8's 18.7%) and 70.6% on OSWorld 2.0, beating Fable 5's best computer-use result at a third of the cost | |
| Cybersecurity capability and safeguards | OpenAI's strongest cyber model yet; competitive with Mythos Preview on ExploitBench using about one-third of the output tokens; cleared after government safety review | Anthropic's own safety audit rates Opus 5 the least likely of its current models to behave deceptively, though no equivalent ExploitBench-style claim is published | |
| Price per million tokens | Sol $5/$30; Terra $2.50/$15; Luna $1/$6, plus explicit cache breakpoints and a 90% cache-read discount; also bundled in ChatGPT Plus $20 / Pro $100 | $5/$25 input/output, unchanged from Opus 4.8 despite the capability jump; the new default model on Claude Max | |
| Track record and operating history | Publicly launched July 9, 2026 — over two weeks of broad real-world operating history | Publicly launched July 24, 2026 — the newest frontier model in this comparison, with only days of operating history | |
| Independent validation | Launch evals are OpenAI's own; independent Terminal-Bench and ExploitBench replication has had over two weeks to arrive since GA | Launch evals are Anthropic's own and third-party sites (llm-stats.com, BenchLM.ai); independent replication is only just beginning | |
| Best immediate decision | Pilot Sol on your hardest coding and security evals and cost-route lighter work to Terra/Luna | Re-run your Opus 4.8 evals against Opus 5 before assuming old routing rules still apply, especially for coding-ceiling and computer-use tasks | |
| Total Score | 2/ 8 | 2/ 8 | 4 ties |
Key Statistics
Real data from verified industry sources to support your decision.
CNBC
OpenAI
OpenAI
Anthropic
BenchLM.ai
llm-stats.com
All statistics come from verified third-party sources. Source, year, and direct link are shown on each metric.
When to Choose Each Option
Clear guidance based on your specific situation and needs.
Choose GPT-5.6 Sol when...
- Your workload is command-line coding, vulnerability research or long-horizon agent work where OpenAI's Terminal-Bench 2.1 and ExploitBench claims could pay off
- You want the Sol/Terra/Luna tiering to route by cost: Sol for the hardest tasks, Terra and Luna for cheaper high-volume work
- You already live in the ChatGPT/Codex ecosystem and want GPT-5.6 inside ChatGPT Plus/Pro plus full API access
- You want a model with over two weeks of independent, real-world operating history rather than a days-old launch
Choose Claude Opus 5 when...
- You need the highest available coding ceiling — Opus 5's 96% SWE-bench Verified score is a 7.4-point jump over Opus 4.8 at the same price
- Your workload involves computer-use or frontier reasoning tasks, where Opus 5 posts new highs on OSWorld 2.0 and Frontier-Bench v0.1
- You're already on Claude Max and want Anthropic's new default model without switching providers
- You prefer Anthropic's stable, unchanging published rate card ($5/$25) even as the underlying model's capability jumps
Our Recommendation
Opus 5 arrived with a bigger coding jump than the prior Opus 4.8 baseline had: SWE-bench Verified rose from 88.6% to 96%, a 7.4-point gain at an unchanged price, and Opus 5 more than doubled Opus 4.8's Frontier-Bench v0.1 score while topping every competing model including Fable 5. GPT-5.6 Sol still brings real, differentiated strengths — OpenAI's own Terminal-Bench 2.1 state-of-the-art claim, ExploitBench results competitive with Mythos Preview at roughly a third of the output tokens, and the Sol/Terra/Luna tiering for clean cost routing ($5/$30, $2.50/$15, $1/$6). Neither wins outright: route high-ambition terminal-agent and security workloads to GPT-5.6 Sol, or cost-optimize with Terra/Luna; lean on Claude Opus 5 for the highest available coding ceiling, computer-use execution, and Anthropic's own safety-audit findings around deception resistance. With Opus 5 only days old and GPT-5.6 Sol's independent benchmark replication still arriving, run your own evals before committing either model to production-critical paths.
Frequently Asked Questions
Common questions about this comparison answered.
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