PickAIModel.com - Compare Claude Sonnet 5 and GPT-5.6 Terra
Claude Sonnet 5 vs GPT-5.6 Terra: pricing, Quality, Value, and benchmarks
Side-by-side buyer comparison built from the current published top 10 snapshot. Quality and Value stay deterministic, while editorial verdict excerpts remain clearly AI-labeled.
Verified evidenceProvisional evidence
Claude Sonnet 5 Quality
59.7
GPT-5.6 Terra Quality
62.0
Quality delta
-2.3GPT-5.6 Terra leads
Value delta
+4.7Claude Sonnet 5 leads
Buyer summary
GPT-5.6 Terra leads Quality by 2.3 points. Claude Sonnet 5 leads Value by 4.7 points.
Shared roster
Both pages link back to the same published roster and methodology, so the comparison stays on one deterministic evidence set.
Ship Claude Sonnet 5 as the default Sonnet upgrade for production coding, agentic, and long-context workloads; budget for the September price step-up and reserve Opus for tasks that justify the higher tier.
Monthly price
Claude Pro: $20/month
App access
Claude
Conversation benchmark
~980 chats
Deterministic
Claude Pro public monthly plan reference.
Deterministic
Claude Sonnet 5 is available in Claude and through the Claude API.
The balanced GPT-5.6 option for everyday work, trading some peak capability for lower cost.
Monthly price
ChatGPT access and limits vary by plan and product surface.
App access
ChatGPT
Conversation benchmark
Unavailable
Deterministic
Plan availability is described conservatively without inferring a tier-specific subscription price.
Deterministic
Official GPT-5.6 availability across ChatGPT, Codex, and the API.
Deterministic scores
Quality and Value comparison
Claude Sonnet 5
Q 59.7
V 27.4
Quality rank 4 and value rank 4 in the current published roster.
GPT-5.6 Terra
Q 62.0
V 22.7
Quality rank 3 and value rank 6 in the current published roster.
Buyer access
Pricing, app access, and Conversation Value
Claude Sonnet 5
Deterministic3K tokens/chat
Claude Pro: $20/month
~980 chats
Hosted app: Claude
GPT-5.6 Terra
Deterministic3K tokens/chat
ChatGPT access and limits vary by plan and product surface.
Unavailable
Hosted app: ChatGPT
Benchmark evidence
Claude Sonnet 5
Verified evidence
Humanity's Last Exam
Normalized quality input
43.2%
Anthropic Claude Sonnet 5 system card | Vendor-reported Anthropic Sonnet 5 HLE no-tools score. Do not replace with tools-enabled HLE variants.
SWE-Bench Pro
Software engineering task resolution
63.2%
Anthropic Claude Sonnet 5 system card | Vendor-reported Anthropic Sonnet 5 SWE-Bench Pro score. Do not substitute SWE-Bench Verified.
Terminal-Bench 2.1
Agentic terminal task completion
80.4%
Anthropic Claude Sonnet 5 system card | Vendor-reported Anthropic Sonnet 5 Terminal-Bench 2.1 score using mini-SWE-agent. Display-only companion evidence.
Benchmark evidence
GPT-5.6 Terra
Verified evidence
Humanity's Last Exam
Normalized quality input
41.8%
Artificial Analysis GPT-5.6 Terra max analysis page | Independent Artificial Analysis HLE result for the max-reasoning model variant. This is provisional tier-3 evidence, not an OpenAI-published no-tools HLE result.
SWE-Bench Pro
Software engineering task resolution
63.4%
OpenAI GPT-5.6 release | Vendor-reported OpenAI GPT-5.6 launch result. Preserve the named tier and launch configuration; do not substitute a similarly named benchmark or model variant.
GPQA Diamond
Graduate-level scientific reasoning
92.9%
OpenAI GPT-5.6 release | Vendor-reported OpenAI GPT-5.6 launch result. Preserve the named tier and launch configuration; do not substitute a similarly named benchmark or model variant.
Terminal-Bench 2.1
Agentic terminal task completion
87.4%
OpenAI GPT-5.6 release | Vendor-reported OpenAI GPT-5.6 launch result. Preserve the named tier and launch configuration; do not substitute a similarly named benchmark or model variant.
Editorial excerpt
Claude Sonnet 5
AI-assisted, editorially reviewed
Ship Claude Sonnet 5 as the default Sonnet upgrade for production coding, agentic, and long-context workloads; budget for the September price step-up and reserve Opus for tasks that justify the higher tier.
Claude Sonnet 5 is the right default Sonnet model for most production teams that want stronger coding, agentic, and multi-step performance without moving every workload to Opus. It replaces Sonnet 4.6 in the current Claude lineup, carries stronger accepted-source HLE and SWE-Bench Pro evidence, and adds a 1M token context window that materially improves RAG, repository-scale coding, and document-heavy workflows. The migration still deserves an engineering review: the public row uses Anthropic vendor-reported benchmark evidence, the introductory API price ends after August 31, 2026, and plan-level availability or limits can vary by Claude surface. Treat it as the new default, test your real prompts and retrieval payloads, and route to Opus only when the task genuinely needs the higher-cost tier.
Editorial excerpt
GPT-5.6 Terra
AI-assisted, editorially reviewed
The balanced GPT-5.6 option for everyday work, trading some peak capability for lower cost.
GPT-5.6 Terra is the balanced tier for everyday professional and coding workloads. It gives up some peak performance versus Sol in exchange for lower token pricing, making it the practical default when both capability and cost matter.
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